In last week’s issue of New Scientist (16 August 2014, pp. 24-25), George Marshall wrote a mostly pessimistic opinion piece about the acceptance of human-initiated climate change by the general public. Marshall is founder of the ‘Climate Outreach and Information Network in Oxford, UK,' and author of a book, Don’t Even Think About It; Why our brains are wired to ignore climate change, which is about to be published. This alone will stop many climate change sceptics from reading his article let alone his book.
Basically, he argues that it’s human nature to place more importance on short term pain over long term gain. In other words, we are reluctant to make sacrifices or accept short term costs in favour of long term goals that won’t be seen in our own lifetime and which no one can definitively quantify. Politicians don’t have the political will to overcome the collective inertia or risk election over an issue that many can’t perceive as current or relevant to their own lives. In Australia, and, I suspect elsewhere, this has become an emotionally charged issue with people sending threatening emails to scientists, and claiming that there is some global academic conspiracy to maintain funding and jobs for climate scientists who would otherwise be out of a job if climate change didn’t exist. Such irrationality merely demonstrates how reason is the first casualty when public opinion attempts to overturn peer-reviewed science.
In last week’s episode of ABC’s weekly programme, Q&A, the issue came up and Heather Ridout, a highly respected Australian business woman, currently head of AustralianSuper and a Board member for the Reserve Bank of Australia, seems an unlikely advocate for action on Climate Change, given those credentials, yet argued that the scientific argument is well and truly over and it’s time we accepted the scientific status quo instead of challenging it with spurious and contrary viewpoints that are given the same weight as globally accepted scientific opinion.
Marshall opens his article with a quote from Daniel Kahneman, who won the 2002 Nobel Prize for economics: “…I am deeply pessimistic, I really see no path to success on climate change.” To quote Marshall, Kahneman won the prize ‘for his research on the psychological biases that distort rational decision making.’ In particular, he coined the term “loss aversion”, which is effectively the point I made in the opening of the second paragraph: reluctance to accept short term pain for a long term gain of uncertain magnitude.
Kahneman also talks about “assimilation bias”, which is our ability to make information fit our personal prejudices, which is why people on opposing sides of the political spectrum can have such contradictory views over the same issue, like climate change. The problem with all this, as Marshall expounds, is that, politically, it is much easier to postpone the problem than deal with it now. The easy way out for politicians, is to give it lip service whilst pursuing policies that actually do nothing to address it. This is exactly what our current political leadership is doing in Australia, and I believe it’s happening elsewhere as well.
What I find interesting, in light of the psychological dimension that both Marshall and Kahneman propound, is how the issue seems to fall on the 'right' and 'left' of the political divide. In Australia, a conservative politician lost the leadership of his own party (by 1 vote) when he put climate change on the line, which was very brave, but changed the political landscape in Australia dramatically for the last 3 election terms.
It is the ‘right’ of politics that sees climate change as a furphy and it is the ‘left’ that sees it as one of the foremost challenges of the 21st Century, for the entire world. If one examines politics historically, it is the ‘liberal’ politicians who have led social reforms in areas of equality and social justice that have, in later generations, become mainstream. I predict that this also applies to climate change, where ‘liberal’ politicians are once more showing leadership on a socially contentious issue, that will, in later generations, be accepted as the status quo, as the scientific community has already done.
Monday, 25 August 2014
Sunday, 17 August 2014
Woody Allen’s Magic in the Moonlight
I’ve just seen this movie at NOVA (yes, I’ll give them a plug for Melbournians). In Australia, we are very fortunate in that we have art-house multiplexes, as well as commercial ones. Not all movies are made for teenagers (in particular teenage boys): there are lots of good movies from all over the world made with adults in mind. And Melbourne art-house cinemas are evidence that there is an audience for them, at least in Melbourne. Does that make me a cultural snob? Probably.
About 15 years ago, I was working on an engineering project in the ‘bush’, in north-east Victoria, living in Benalla, which is about 2.5 hrs from Melbourne. About 10 minutes outside of Benalla was a ’one-horse’ town called Swanpool – one of those towns you’d miss if you blinked – I don’t even think it had a pub. But it had a public hall that some locals had converted into a cinema. The seats were cheap and you came rugged up (Benalla is frosty in winter) and brought your own coffee mug to get a cheaper cup of coffee. The point of this little sojourn is that on Saturday nights they screened blockbusters but on Friday nights they screened art-house movies (usually foreign). I saw the Cuban film about homosexuality, Strawberry and Chocolate and the French surrealist film, The City of Lost Children, amongst many others. I remember sending an email to an ex-pat friend living in California that art-house cinema was alive and well in country Victoria.
Woody Allen is going through a European phase, and Magic in the Moonlight is no exception, set on the Cote d’Azur in France. Amongst his more recent films, I think To Rome With Love failed to hit the mark, but Midnight in Paris was a work of genius. I also enjoyed You’ll Meet a Tall Dark Stranger, even though it didn’t get good reviews; I liked it for Allen’s ability to put up a mirror to our humanly flaws, and loved it for the Faustian twist in its tail.
Which brings me to Magic in the Moonlight, starring British acting icon, Colin Firth. It’s masterly economical in the way Allen leads us through the narrative, referencing the next scene in its predecessor, so that the story flows without any intellectual or logical hurdles to deal with. And yes, it’s predictable but we don’t know how it will be resolved, so that sort of predictability is welcome, especially when the resolution is both logical and a surprise, as it is in this film. The resolution of the romantic dimension is less a surprise but it’s treated in an unusual and humourous fashion.
But the reason I’m writing about this particular Allen film is because it has a philosophical dimension. Colin Firth’s character, ‘Stanley Crawford’, is a sceptic in the tradition of James Randi, and he meets his match in ‘Sophie Baker’ (Emma Stone), an American ‘psychic’, and the rest I won’t tell you. In fact, I haven’t told you any more than you can deduce from the trailer. The point is that Allen plays with his audience, knowing they will take sides in this philosophical-oriented debate: is there something beyond the world we can see? In effect, he tackles the divide between the hard-nosed scientists and empiricist philosophers and the romantic idealists who believe or like to believe that life holds more meaning than the short span of our years.
About 15 years ago, I was working on an engineering project in the ‘bush’, in north-east Victoria, living in Benalla, which is about 2.5 hrs from Melbourne. About 10 minutes outside of Benalla was a ’one-horse’ town called Swanpool – one of those towns you’d miss if you blinked – I don’t even think it had a pub. But it had a public hall that some locals had converted into a cinema. The seats were cheap and you came rugged up (Benalla is frosty in winter) and brought your own coffee mug to get a cheaper cup of coffee. The point of this little sojourn is that on Saturday nights they screened blockbusters but on Friday nights they screened art-house movies (usually foreign). I saw the Cuban film about homosexuality, Strawberry and Chocolate and the French surrealist film, The City of Lost Children, amongst many others. I remember sending an email to an ex-pat friend living in California that art-house cinema was alive and well in country Victoria.
Woody Allen is going through a European phase, and Magic in the Moonlight is no exception, set on the Cote d’Azur in France. Amongst his more recent films, I think To Rome With Love failed to hit the mark, but Midnight in Paris was a work of genius. I also enjoyed You’ll Meet a Tall Dark Stranger, even though it didn’t get good reviews; I liked it for Allen’s ability to put up a mirror to our humanly flaws, and loved it for the Faustian twist in its tail.
Which brings me to Magic in the Moonlight, starring British acting icon, Colin Firth. It’s masterly economical in the way Allen leads us through the narrative, referencing the next scene in its predecessor, so that the story flows without any intellectual or logical hurdles to deal with. And yes, it’s predictable but we don’t know how it will be resolved, so that sort of predictability is welcome, especially when the resolution is both logical and a surprise, as it is in this film. The resolution of the romantic dimension is less a surprise but it’s treated in an unusual and humourous fashion.
But the reason I’m writing about this particular Allen film is because it has a philosophical dimension. Colin Firth’s character, ‘Stanley Crawford’, is a sceptic in the tradition of James Randi, and he meets his match in ‘Sophie Baker’ (Emma Stone), an American ‘psychic’, and the rest I won’t tell you. In fact, I haven’t told you any more than you can deduce from the trailer. The point is that Allen plays with his audience, knowing they will take sides in this philosophical-oriented debate: is there something beyond the world we can see? In effect, he tackles the divide between the hard-nosed scientists and empiricist philosophers and the romantic idealists who believe or like to believe that life holds more meaning than the short span of our years.
Sunday, 10 August 2014
Don’t judge all Muslims the same
In Philosophy Now (Issue 102, May/June 2014), Terri Murray (Master of Theology, Heythrop College, London) wrote an essay titled, Is Judging Islamic Culture Possible? Now I’ve touched on this topic before in various guises, but it’s perhaps more relevant than ever with the rise of ISIS or IS (Islamic State) with its self-appointed Caliphate and its barbaric treatment of anyone who won’t follow its dictates.
Murray’s article is lengthy and well-argued, so it’s a bit unfair to distill her arguments into succinct sound-bytes, as I’m about to do. Basically, Murray delineates between what she calls ‘liberal multiculturalism’ and ‘pluralist multiculturalism’: where she contends the former (of which she claims to belong) puts the rights of the individual above cultural identity; and the latter where cultural identity holds sway over individual liberty. That’s the gist of her argument, but, in particular, she compares this with feminism and LBGT rights, both of which she’s been an outspoken advocate of, or so she tells us, and I have no reason to disbelieve her.
But she also refers to the ‘pluralist multiculturalists’ as ‘relativists’, and much of her argument revolves around this, contextually. In effect, the moral or cultural relativists argue that we in the West are not in a position to criticise other cultures and Islamic culture in particular – political correctness gone mad, is how many conservatives and some liberals would put it.
Murray lives in England and I live in Australia, where cultural sensitivities are not dissimilar but not exactly the same. I both work and socialise with Muslims, some of whom I consider very good friends, which naturally colours my own perceptions and opinions, but that’s not the issue. In a post last year (Aug. 2013), I argued that there was no such thing as moral relativism, whereas Murray’s argument effectively hinges on that idea. I argued that no one can hold a moral standpoint on an issue that covers every perceived view – it’s impossible – so what she’s talking about is tolerance, as she acknowledges herself. But I’ve also argued elsewhere that the limit of tolerance is intolerance by others. Like many so-called liberals, I’m intolerant of intolerance, and that is the guiding criterion when it comes to judging Islam or variants of Islam or any other cultural practice.
Moral values, as practiced, are invariably subjective, and arise from cultural or social norms that we are exposed to from our earliest cognitive years. But in our teens and early twenties, our so-called ‘formative’ years, we can undergo changes in attitudes and beliefs and often challenge the views we were brought up with. It is my belief that many members of IS, especially those from a Western background, fall into this category. Why they are attracted to this ideology, I can neither imagine nor understand, but we know it’s happening. The point is that while many of us find their behaviour abhorrent in the worst possible way, they believe the opposite and claim that it is our lifestyle that is sinful and against the laws of ‘God’, which is how they justify what they do. As I’ve said before, when you take your morals from ‘God’ you can justify any atrocity.
The danger, as I see it, is in taking a polarised view. Murray is arguing against one of those polarised views: that we must accept and tolerate all manifestations of Islam irrespective of its consequences on individuals. Even forgetting about IS for the moment (Murray’s article was written prior to IS’s rise to dominance in Syria and Iraq), issues like female genitalia mutilation and honour killings are examples where the rights of individuals trump cultural tolerance and sensitivity, as Murray points out. But there is another form of polarisation that is equally dangerous and far more likely, which is to brand all Muslims with the same brush. We already see this with religious commentators like Richard Dawkins and Sam Harris, both of whom attack all kinds of religion and argue that moderate religious believers somehow support fundamentalism, which is simplistic, divisive and plain wrong. No one suffers under militant Islam more than moderate Muslims as we are currently witnessing in Iraq, but also Indonesia and other countries. To alienate moderate Muslims in a ‘war’ against Islamic extremists is a huge mistake. In Australia, at least, politicians and strategists seem to be very aware of this dimension to the issue, at least, locally.
Murray’s article is lengthy and well-argued, so it’s a bit unfair to distill her arguments into succinct sound-bytes, as I’m about to do. Basically, Murray delineates between what she calls ‘liberal multiculturalism’ and ‘pluralist multiculturalism’: where she contends the former (of which she claims to belong) puts the rights of the individual above cultural identity; and the latter where cultural identity holds sway over individual liberty. That’s the gist of her argument, but, in particular, she compares this with feminism and LBGT rights, both of which she’s been an outspoken advocate of, or so she tells us, and I have no reason to disbelieve her.
But she also refers to the ‘pluralist multiculturalists’ as ‘relativists’, and much of her argument revolves around this, contextually. In effect, the moral or cultural relativists argue that we in the West are not in a position to criticise other cultures and Islamic culture in particular – political correctness gone mad, is how many conservatives and some liberals would put it.
Murray lives in England and I live in Australia, where cultural sensitivities are not dissimilar but not exactly the same. I both work and socialise with Muslims, some of whom I consider very good friends, which naturally colours my own perceptions and opinions, but that’s not the issue. In a post last year (Aug. 2013), I argued that there was no such thing as moral relativism, whereas Murray’s argument effectively hinges on that idea. I argued that no one can hold a moral standpoint on an issue that covers every perceived view – it’s impossible – so what she’s talking about is tolerance, as she acknowledges herself. But I’ve also argued elsewhere that the limit of tolerance is intolerance by others. Like many so-called liberals, I’m intolerant of intolerance, and that is the guiding criterion when it comes to judging Islam or variants of Islam or any other cultural practice.
Moral values, as practiced, are invariably subjective, and arise from cultural or social norms that we are exposed to from our earliest cognitive years. But in our teens and early twenties, our so-called ‘formative’ years, we can undergo changes in attitudes and beliefs and often challenge the views we were brought up with. It is my belief that many members of IS, especially those from a Western background, fall into this category. Why they are attracted to this ideology, I can neither imagine nor understand, but we know it’s happening. The point is that while many of us find their behaviour abhorrent in the worst possible way, they believe the opposite and claim that it is our lifestyle that is sinful and against the laws of ‘God’, which is how they justify what they do. As I’ve said before, when you take your morals from ‘God’ you can justify any atrocity.
The danger, as I see it, is in taking a polarised view. Murray is arguing against one of those polarised views: that we must accept and tolerate all manifestations of Islam irrespective of its consequences on individuals. Even forgetting about IS for the moment (Murray’s article was written prior to IS’s rise to dominance in Syria and Iraq), issues like female genitalia mutilation and honour killings are examples where the rights of individuals trump cultural tolerance and sensitivity, as Murray points out. But there is another form of polarisation that is equally dangerous and far more likely, which is to brand all Muslims with the same brush. We already see this with religious commentators like Richard Dawkins and Sam Harris, both of whom attack all kinds of religion and argue that moderate religious believers somehow support fundamentalism, which is simplistic, divisive and plain wrong. No one suffers under militant Islam more than moderate Muslims as we are currently witnessing in Iraq, but also Indonesia and other countries. To alienate moderate Muslims in a ‘war’ against Islamic extremists is a huge mistake. In Australia, at least, politicians and strategists seem to be very aware of this dimension to the issue, at least, locally.
Saturday, 19 July 2014
Understeer, oversteer and steering in general
I promise that this will be my last post on this subject. Well, I shouldn’t promise, but I don’t want to change the fundamental nature of my blog. Driving is a basic life-skill in modern societies and people die from it, therefore it’s worth a bit of print. In fact, people receive horrendous injuries, comparable to what one might get in a war, but few of us ever think about that when we get into a car, otherwise we probably wouldn’t.
Airline pilots go through training drills regularly, which is why they can cope with most things that try to spill them out of the sky. In the case of driving, which most of us do above a certain age, the only training we get, beyond how to operate a vehicle and the local road rules, is what we learn ourselves. I’m a firm believer that we should be teaching kids how to drive in schools, and teaching them so-called advanced driving skills like how to brake and swerve at the same time. I know at least one driver who is convinced that if she swerves she will roll the vehicle, so she’s probably the norm rather than the exception. I know another driver who won’t drive on the shoulder because the prospect scares him to death. I’ve done both on more than one occasion and avoided certain disaster on each occasion.
So what can I possibly write on a blog that may help? Well I can explain the dynamics of a car when cornering because that’s the essence of driving in my view. I believe a car should be an extension of your mind and body, because in some ways it is. You think and act which produces effects that change direction and change speeds, often at the same time, in response to visual and sensory stimuli. The sensory stimuli include your sense of balance, the strain on the muscles of your neck, the weight of the steering wheel and the pressure you feel on the brake pedal. What’s more, you can’t see the extremities of your vehicle, let alone where the wheels touch the ground, yet you can place it on the road with centimeter precision, out of sheer practice.
Of course, some cars do this better than others, and, unfortunately, a lot of cars are designed and manufactured to do the opposite: isolate the driver from the driving experience as much as possible, so they can indulge in the illusion that the car does the driving for them. I guess this makes me old-fashioned; I even drive a manual.
Most cars are designed to understeer when pushed because that’s what most drivers expect and what they are comfortable dealing with. Understeer is technically when the front wheels slip more than the rear and oversteer is the opposite when the rear wheels slip more than the front. In real world terms, understeer is when the front of the car runs wide in a corner and oversteer is when it feels like the back is trying to overtake the front, and, in extremis, can lead to the car spinning. Spinning is not so bad an outcome, by the way, because the car loses its energy and doesn’t go anywhere, like sliding into a tree or another car. I’ve seen people spin cars, unintentionally, and they came out unscathed. It’s also why racing drivers spin their cars, intentionally, when they lose control, to try and lose as much kinetic energy (speed) as quickly as possible. These days, most cars have ESP (electronic stability programmes) or some such acronym, so spinning a car may be next to impossible. I don’t know, I haven’t tried recently.
Getting back to understeer, the antidote is pretty simple: you take your foot off the throttle or apply more steering lock or both, both of which are the opposite to what created it in the first place, so it’s easy and intuitive to do.
Some cars are designed to be neutral or well balanced, which means, that under ideal conditions, they let go at the front and rear simultaneously. This is my own personal preference, because you can change it from understeer to oversteer or vice versa. You may ask: what could possibly be the advantage of oversteer? Well, mild oversteer, as opposed to snap oversteer, can help to point the car into the corner, and well-balanced cars facilitate this in a very non-threatening and confidence-building manner. In most driving circumstances, there are only 2 inputs involved in cornering: steering and throttle. Throttle allows you to adjust the car and, in combination with steering, you can finesse it around a corner without lurid slides or screeching tyres, just fluid and efficient progress that impresses people rather than scaring them.
Now, it needs to be pointed out that front-wheel-drive cars are often particularly adept at this steering on the throttle, as it’s called, and lift-off oversteer is possible. In other words, you may get dramatic oversteer from simply lifting off the throttle sharply, though, with the electronic intervention that all modern cars have, this is unlikely. Rear-wheel-drive cars do the opposite and can be made to oversteer with extra application of the throttle, but again, modern electronics, makes this unlikely in today’s cars.
Finally, I wish to point out something that is not generally spoken or written about, and that is that steering is one of those skills that the brain delegates to the subconscious, as it does other skills like walking, or hitting a ball with a cricket bat or a tennis racket or a baseball bat. Fingering skills that musicians learn also fall into this category so they become automatic and we can do them without thinking about them. In fact, the brain does this, out of practice, so it can think about more important things.
So I don’t believe that anyone thinks about steering when they drive a car around a corner – I know I don’t – I just do it. What I think about when approaching a corner is what gear I should be in, whether I brake or just lift off the throttle, so I’m only thinking about things that affect my speed of entry. I never think about where I should put my hands on the wheel or when I should turn in or even where I should apex the corner – I do all of that automatically. But speaking about speed, one of the worse things you can do is look at the speedo when you’re entering a corner – I’m sure a lot of accidents have occurred because of that – yet no one ever tells you. It’s like taking your eye off the ball. If you want to know what speed you’re doing around a corner, then look at the speedo on exit, not on entry. Also, possibly the worst thing you can do is enter a corner with a preconceived speed in your head, and have it on the speedo before you commit. You should be able to judge what speed to do around a corner without looking at the speedo – in fact, I think that’s fundamental.
Lastly (I know I’ve already said finally) a lot of ink has been used and many words spoken on the technique you should use for steering. There are 2 favoured methods: feeding the hand and the racing driver technique. I think there’s a place for both of them, but I have another which I evolved myself without any instruction. When I was learning to drive (in Oz) driving instructors were teaching what I call the shuffle technique, whereby student drivers were shuffling the wheel in short strokes in order to keep their hands on opposite sides of the wheel at all times. I was reminded of this recently when I was a passenger in a car where a woman of my vintage was doing a 3 point turn using this very technique. Now, it’s not her fault – it’s what she was taught, and because the brain delegates this to the subconscious she’s condemned to do it for the rest of her driving life.
What I believe these instructors were trying to teach was the ‘feed-the-hand’ technique, whereby we turn one hand over the top of the wheel - left hand for right turning and right hand for left turning – into the opposing hand which remains stationary. Thus, when we have applied the correct lock, our opposing hand is in the correct position to control the car. By correct position, I mean it’s ideally placed for maximum leverage and control which is on the side of the wheel. In fact, this is the best position to have both hands when we are driving straight ahead as well. In some cars there are little indents for the thumbs that facilitate this position when the steering wheel is in the straight ahead position.
And this is the position that’s advocated in the so-called racing driver technique, only they don’t change their position when they turn the wheel. I'm a firm believer in adopting the racing driver technique as a default position because it’s the best place to have your hands if you need to swerve. When you swerve, it’s always a reflex action and you don’t have time to change positions or move your hands on the wheel.
However, when approaching a corner, I move one of my hands over the wheel (depending which way I need to turn) so it automatically applies the right amount of lock when it returns to the default position (on the side) with wheel in hand. In other words, instead of feeding my hand, I grab the amount of wheel I think I’ll need. The difference, in practice, is that with feeding-the-hand, one hand ‘hands over’ to the other at some point in the process; whereas, with my technique, the handover occurs before you actually turn the wheel. Now, I’m not the only one who does this, but no one taught me: it just evolved and I do it without thinking. It has the advantage that subconsciously I must intuit how tight the corner is as I judge how much lock I need before I enter the corner. Once I’m in the corner, my hands (both of them) are on opposing sides of the wheel which gives me best control. The only time I use the feed-the-hand technique is when I know I need more than one handful of lock, and I have to reach one hand over the other, which is the case for most suburban intersections.
There is one other advantage in a well-balanced or neutral car and that is that if it slides it will correct itself due to the underlying physics – the car will intrinsically seek neutrality. In other words, in an oversteer slide I will simply let go of the steering wheel and the car will correct itself. So why should a car slide? Well, it depends on the conditions, like mud or snow or slush, so I’m not talking high speeds. Even with electronic intervention, slides are possible if the conditions are diabolical enough.
I haven’t mentioned how important good tyres are – they are your lifeline – and how equally important it is to maintain their air pressure. I put air in mine about every 1,000km (600 miles) or every second time I fill up with petrol. They lose around 2-3psi in that time, so I put in an extra 2psi more than what is recommended by the manufacturer. Imagine how much you would care about your tyres and air pressure if you only had 2 wheels instead of 4.
Addendum: I need to say something about cruise control. In Australia, cruise control is very popular, partly because people use it to avoid breaking speed limits. Australia has the lowest tolerance to exceeding speed limits of probably anywhere in the world. Having said all that, I never use cruise control, because I have a psychological problem with giving up that aspect of the car’s control – I like to know I’m controlling the car’s speed all the time. I know that makes me an outstanding exception. The problem with cruise control, as I see it, is that we give up our sense of speed - we delegate it to the car - though I consider it to be essential to driving. By sense of speed, I mean we know longer make judgements about how fast we should be going, because we no longer are allowed to.
Addendum: Can I just say that probably the best book on this subject is How to Drive by Ben Collins, aka The Stig (from Top Gear). Unlike me, he's a professional driver. He was also a stunt driver for at least one James Bond movie.
Airline pilots go through training drills regularly, which is why they can cope with most things that try to spill them out of the sky. In the case of driving, which most of us do above a certain age, the only training we get, beyond how to operate a vehicle and the local road rules, is what we learn ourselves. I’m a firm believer that we should be teaching kids how to drive in schools, and teaching them so-called advanced driving skills like how to brake and swerve at the same time. I know at least one driver who is convinced that if she swerves she will roll the vehicle, so she’s probably the norm rather than the exception. I know another driver who won’t drive on the shoulder because the prospect scares him to death. I’ve done both on more than one occasion and avoided certain disaster on each occasion.
So what can I possibly write on a blog that may help? Well I can explain the dynamics of a car when cornering because that’s the essence of driving in my view. I believe a car should be an extension of your mind and body, because in some ways it is. You think and act which produces effects that change direction and change speeds, often at the same time, in response to visual and sensory stimuli. The sensory stimuli include your sense of balance, the strain on the muscles of your neck, the weight of the steering wheel and the pressure you feel on the brake pedal. What’s more, you can’t see the extremities of your vehicle, let alone where the wheels touch the ground, yet you can place it on the road with centimeter precision, out of sheer practice.
Of course, some cars do this better than others, and, unfortunately, a lot of cars are designed and manufactured to do the opposite: isolate the driver from the driving experience as much as possible, so they can indulge in the illusion that the car does the driving for them. I guess this makes me old-fashioned; I even drive a manual.
Most cars are designed to understeer when pushed because that’s what most drivers expect and what they are comfortable dealing with. Understeer is technically when the front wheels slip more than the rear and oversteer is the opposite when the rear wheels slip more than the front. In real world terms, understeer is when the front of the car runs wide in a corner and oversteer is when it feels like the back is trying to overtake the front, and, in extremis, can lead to the car spinning. Spinning is not so bad an outcome, by the way, because the car loses its energy and doesn’t go anywhere, like sliding into a tree or another car. I’ve seen people spin cars, unintentionally, and they came out unscathed. It’s also why racing drivers spin their cars, intentionally, when they lose control, to try and lose as much kinetic energy (speed) as quickly as possible. These days, most cars have ESP (electronic stability programmes) or some such acronym, so spinning a car may be next to impossible. I don’t know, I haven’t tried recently.
Getting back to understeer, the antidote is pretty simple: you take your foot off the throttle or apply more steering lock or both, both of which are the opposite to what created it in the first place, so it’s easy and intuitive to do.
Some cars are designed to be neutral or well balanced, which means, that under ideal conditions, they let go at the front and rear simultaneously. This is my own personal preference, because you can change it from understeer to oversteer or vice versa. You may ask: what could possibly be the advantage of oversteer? Well, mild oversteer, as opposed to snap oversteer, can help to point the car into the corner, and well-balanced cars facilitate this in a very non-threatening and confidence-building manner. In most driving circumstances, there are only 2 inputs involved in cornering: steering and throttle. Throttle allows you to adjust the car and, in combination with steering, you can finesse it around a corner without lurid slides or screeching tyres, just fluid and efficient progress that impresses people rather than scaring them.
Now, it needs to be pointed out that front-wheel-drive cars are often particularly adept at this steering on the throttle, as it’s called, and lift-off oversteer is possible. In other words, you may get dramatic oversteer from simply lifting off the throttle sharply, though, with the electronic intervention that all modern cars have, this is unlikely. Rear-wheel-drive cars do the opposite and can be made to oversteer with extra application of the throttle, but again, modern electronics, makes this unlikely in today’s cars.
Finally, I wish to point out something that is not generally spoken or written about, and that is that steering is one of those skills that the brain delegates to the subconscious, as it does other skills like walking, or hitting a ball with a cricket bat or a tennis racket or a baseball bat. Fingering skills that musicians learn also fall into this category so they become automatic and we can do them without thinking about them. In fact, the brain does this, out of practice, so it can think about more important things.
So I don’t believe that anyone thinks about steering when they drive a car around a corner – I know I don’t – I just do it. What I think about when approaching a corner is what gear I should be in, whether I brake or just lift off the throttle, so I’m only thinking about things that affect my speed of entry. I never think about where I should put my hands on the wheel or when I should turn in or even where I should apex the corner – I do all of that automatically. But speaking about speed, one of the worse things you can do is look at the speedo when you’re entering a corner – I’m sure a lot of accidents have occurred because of that – yet no one ever tells you. It’s like taking your eye off the ball. If you want to know what speed you’re doing around a corner, then look at the speedo on exit, not on entry. Also, possibly the worst thing you can do is enter a corner with a preconceived speed in your head, and have it on the speedo before you commit. You should be able to judge what speed to do around a corner without looking at the speedo – in fact, I think that’s fundamental.
Lastly (I know I’ve already said finally) a lot of ink has been used and many words spoken on the technique you should use for steering. There are 2 favoured methods: feeding the hand and the racing driver technique. I think there’s a place for both of them, but I have another which I evolved myself without any instruction. When I was learning to drive (in Oz) driving instructors were teaching what I call the shuffle technique, whereby student drivers were shuffling the wheel in short strokes in order to keep their hands on opposite sides of the wheel at all times. I was reminded of this recently when I was a passenger in a car where a woman of my vintage was doing a 3 point turn using this very technique. Now, it’s not her fault – it’s what she was taught, and because the brain delegates this to the subconscious she’s condemned to do it for the rest of her driving life.
What I believe these instructors were trying to teach was the ‘feed-the-hand’ technique, whereby we turn one hand over the top of the wheel - left hand for right turning and right hand for left turning – into the opposing hand which remains stationary. Thus, when we have applied the correct lock, our opposing hand is in the correct position to control the car. By correct position, I mean it’s ideally placed for maximum leverage and control which is on the side of the wheel. In fact, this is the best position to have both hands when we are driving straight ahead as well. In some cars there are little indents for the thumbs that facilitate this position when the steering wheel is in the straight ahead position.
And this is the position that’s advocated in the so-called racing driver technique, only they don’t change their position when they turn the wheel. I'm a firm believer in adopting the racing driver technique as a default position because it’s the best place to have your hands if you need to swerve. When you swerve, it’s always a reflex action and you don’t have time to change positions or move your hands on the wheel.
However, when approaching a corner, I move one of my hands over the wheel (depending which way I need to turn) so it automatically applies the right amount of lock when it returns to the default position (on the side) with wheel in hand. In other words, instead of feeding my hand, I grab the amount of wheel I think I’ll need. The difference, in practice, is that with feeding-the-hand, one hand ‘hands over’ to the other at some point in the process; whereas, with my technique, the handover occurs before you actually turn the wheel. Now, I’m not the only one who does this, but no one taught me: it just evolved and I do it without thinking. It has the advantage that subconsciously I must intuit how tight the corner is as I judge how much lock I need before I enter the corner. Once I’m in the corner, my hands (both of them) are on opposing sides of the wheel which gives me best control. The only time I use the feed-the-hand technique is when I know I need more than one handful of lock, and I have to reach one hand over the other, which is the case for most suburban intersections.
There is one other advantage in a well-balanced or neutral car and that is that if it slides it will correct itself due to the underlying physics – the car will intrinsically seek neutrality. In other words, in an oversteer slide I will simply let go of the steering wheel and the car will correct itself. So why should a car slide? Well, it depends on the conditions, like mud or snow or slush, so I’m not talking high speeds. Even with electronic intervention, slides are possible if the conditions are diabolical enough.
I haven’t mentioned how important good tyres are – they are your lifeline – and how equally important it is to maintain their air pressure. I put air in mine about every 1,000km (600 miles) or every second time I fill up with petrol. They lose around 2-3psi in that time, so I put in an extra 2psi more than what is recommended by the manufacturer. Imagine how much you would care about your tyres and air pressure if you only had 2 wheels instead of 4.
Addendum: I need to say something about cruise control. In Australia, cruise control is very popular, partly because people use it to avoid breaking speed limits. Australia has the lowest tolerance to exceeding speed limits of probably anywhere in the world. Having said all that, I never use cruise control, because I have a psychological problem with giving up that aspect of the car’s control – I like to know I’m controlling the car’s speed all the time. I know that makes me an outstanding exception. The problem with cruise control, as I see it, is that we give up our sense of speed - we delegate it to the car - though I consider it to be essential to driving. By sense of speed, I mean we know longer make judgements about how fast we should be going, because we no longer are allowed to.
Addendum: Can I just say that probably the best book on this subject is How to Drive by Ben Collins, aka The Stig (from Top Gear). Unlike me, he's a professional driver. He was also a stunt driver for at least one James Bond movie.
Sunday, 13 July 2014
The Physics of Motorcycling
Since I wrote a post on the Physics of Driving (March 2014), it seems only logical and fair to write one on the physics of motorcycle riding. The physics is more complex and counter-intuitive, but it’s also more intriguing.
In both cases the driving force (excuse the pun) is gyroscopic dynamics, though, in the case of a motorcycle, it’s both more central and more controlling. I can still remember the first time I went round a decent corner (as opposed to a street intersection) on a motorcycle and felt the inherent weightlessness it generates. This is the appeal of riding a bike and what separates the experience viscerally from driving a car.
As I’ve already explained in my previous post on driving, it’s the muscle strain on our necks that tells us how hard we are cornering, whether we are in a car or on a bike, though the effect is reversed from one to the other. In the case of a car we lean our heads into the corner to balance the semi-circular canals in our ears, and our neck muscles subconsciously tell us what the lateral force is in a subjective sensory manner. In the case of a bike we lean our bodies and keep our heads upright - because we feel effectively weightless - but the strain on our neck muscles is exactly the same, even though it is reversed.
So that explains how it feels but it doesn’t explain how it all works. The physics is not easy to grasp, but the effect is relatively easy to explain, even if one doesn’t understand the dynamics behind it, so please persevere with me. There is a second law of angular momentum, which effectively says that if you apply a torque around an axis perpendicular to the rotating axis, you will get a rotation around the third axis, called precession. One usually draws diagrams at this stage to demonstrate this, but I can do better: I will give you an example that you may be able to perform at home.
A surveyor’s plumb bob works best to demonstrate this, but a bicycle wheel can work as well. Take a plumb bob with its string wrapped around it, hold it horizontally so the wound string is vertical, then let it go while holding the end of the string. As it falls the unwinding string makes the plumb bob spin about its horizontal axis, but when it gets to the end of the string, it doesn’t fall over. It precesses, giving the impression of weightlessness. This YouTube video demonstrates what I’m talking about rather dramatically with a heavy flywheel, and its sequel demonstrates it even better, and explains the so-called weightless effect. And this video explains the physics concerning the 3 axes using an ordinary bicycle wheel on the end of a rope (which you may be able to do yourself) .
So what has all this physics got to do with riding a motorcycle? It’s what gets you around a corner – as simple as that – but the way it does it is completely counter-intuitive. To get the bike to lean over we apply a torque, via the handlebars, perpendicular to the rotational axis, only we apply it in the opposite direction to what we might think. Basically, if you push on the bar in the direction you want to turn, it will lean over in that direction. By ‘push’ I mean you push on the left bar to lean left and on the right bar to lean right. This is the counter-intuitive part, because we would think that if we pushed on the left bar the wheel would turn right. In fact, I’ve argued about this with people who ride motorbikes, but I know it’s true because, I not only understand the physics behind it, I put it into practice in over a decade of riding.
Now, when the bike leans over, it behaves exactly the same as the fly-wheel in the videos, and, under the force of gravity, the bike precesses around the corner, generating a feeling of weightlessness at the same time.
So that’s the core of the physics of riding a motorcycle but there’s more. In a car you can swerve and brake at the same time, as any advanced driving course will teach you. But on a bike you can do one or the other but not both. If you brake in a corner, the bike will ‘stand up’ and there is nothing you can do about it. This is different to simply closing the throttle, when the bike will tighten its line (turn tighter). Now, why this quirk of physics may seem catastrophic, it’s what allows you to brake in a corner at all. You see the bike will still follow the same curved trajectory while it’s slowing down, and it does it without any intervention from you except for the application of brakes.
The other laws of physics I explained in my last post, regarding the inverse law of speed versus rate-of-change of direction, and the braking distance following the speed squared law still apply. In other words, it takes twice as long to change direction at double the speed, and it takes 4 times the distance to brake at double the speed.
In both cases the driving force (excuse the pun) is gyroscopic dynamics, though, in the case of a motorcycle, it’s both more central and more controlling. I can still remember the first time I went round a decent corner (as opposed to a street intersection) on a motorcycle and felt the inherent weightlessness it generates. This is the appeal of riding a bike and what separates the experience viscerally from driving a car.
As I’ve already explained in my previous post on driving, it’s the muscle strain on our necks that tells us how hard we are cornering, whether we are in a car or on a bike, though the effect is reversed from one to the other. In the case of a car we lean our heads into the corner to balance the semi-circular canals in our ears, and our neck muscles subconsciously tell us what the lateral force is in a subjective sensory manner. In the case of a bike we lean our bodies and keep our heads upright - because we feel effectively weightless - but the strain on our neck muscles is exactly the same, even though it is reversed.
So that explains how it feels but it doesn’t explain how it all works. The physics is not easy to grasp, but the effect is relatively easy to explain, even if one doesn’t understand the dynamics behind it, so please persevere with me. There is a second law of angular momentum, which effectively says that if you apply a torque around an axis perpendicular to the rotating axis, you will get a rotation around the third axis, called precession. One usually draws diagrams at this stage to demonstrate this, but I can do better: I will give you an example that you may be able to perform at home.
A surveyor’s plumb bob works best to demonstrate this, but a bicycle wheel can work as well. Take a plumb bob with its string wrapped around it, hold it horizontally so the wound string is vertical, then let it go while holding the end of the string. As it falls the unwinding string makes the plumb bob spin about its horizontal axis, but when it gets to the end of the string, it doesn’t fall over. It precesses, giving the impression of weightlessness. This YouTube video demonstrates what I’m talking about rather dramatically with a heavy flywheel, and its sequel demonstrates it even better, and explains the so-called weightless effect. And this video explains the physics concerning the 3 axes using an ordinary bicycle wheel on the end of a rope (which you may be able to do yourself) .
So what has all this physics got to do with riding a motorcycle? It’s what gets you around a corner – as simple as that – but the way it does it is completely counter-intuitive. To get the bike to lean over we apply a torque, via the handlebars, perpendicular to the rotational axis, only we apply it in the opposite direction to what we might think. Basically, if you push on the bar in the direction you want to turn, it will lean over in that direction. By ‘push’ I mean you push on the left bar to lean left and on the right bar to lean right. This is the counter-intuitive part, because we would think that if we pushed on the left bar the wheel would turn right. In fact, I’ve argued about this with people who ride motorbikes, but I know it’s true because, I not only understand the physics behind it, I put it into practice in over a decade of riding.
Now, when the bike leans over, it behaves exactly the same as the fly-wheel in the videos, and, under the force of gravity, the bike precesses around the corner, generating a feeling of weightlessness at the same time.
So that’s the core of the physics of riding a motorcycle but there’s more. In a car you can swerve and brake at the same time, as any advanced driving course will teach you. But on a bike you can do one or the other but not both. If you brake in a corner, the bike will ‘stand up’ and there is nothing you can do about it. This is different to simply closing the throttle, when the bike will tighten its line (turn tighter). Now, why this quirk of physics may seem catastrophic, it’s what allows you to brake in a corner at all. You see the bike will still follow the same curved trajectory while it’s slowing down, and it does it without any intervention from you except for the application of brakes.
The other laws of physics I explained in my last post, regarding the inverse law of speed versus rate-of-change of direction, and the braking distance following the speed squared law still apply. In other words, it takes twice as long to change direction at double the speed, and it takes 4 times the distance to brake at double the speed.
Monday, 26 May 2014
Why consciousness is unique to the animal kingdom
I’ve written a number of posts on consciousness over the last 7 years, or whenever it was I started blogging, so this is a refinement of what’s gone before, and possibly a more substantial argument. It arose from a discussion in New Scientist 24 May 2014 (Letters) concerning the evolution of consciousness and, in particular the question: ‘What need is there of actual consciousness?’ (Eric Kvaalen from France).
I’ve argued in a previous post that consciousness evolved early and it arose from emotions, not logic. In particular, early sentient creatures would have relied on fear, pain and desire, as these do pose an evolutionary advantage, especially if memory is also involved. In fact, I’ve argued that consciousness without memory is pretty useless, otherwise the organism (including humans) wouldn’t even know it was conscious (see my post on Afterlife, March 2014).
Many philosophers and scientists argue that AI (Artificial Intelligence) will become sentient. The interesting argument is that ‘we will know’ (referencing New Scientist Editorial, 2 April 2011) because we don’t know that anyone else is conscious either. In other words, the argument goes that if an AI behaves like it’s conscious or sentient, then it must be. However, I argue that AI entities don’t have emotions unless they are programmed artificially to behave like they do – i.e. simulated. And this is a major distinction, if one believes, as I do, that sentience arose from emotions (feelings) and not logic or reason.
But in answer to the question posed above, one only has to look at another very prevalent life form on this planet, which is not sentient, and the answer, I would suggest, becomes obvious. I’m talking about vegetation. And what is the fundamental difference? There is no evolutionary advantage to vegetation having sentience, or, more specifically, having feelings. If a plant was to feel pain or fear, how could it respond? Compared to members of the animal kingdom, it cannot escape the source, because it is literally rooted to the spot. And this is why I believe animals evolved consciousness (sentience by another name) and plants didn’t. Now, there may be degrees of consciousness in animals (we don’t know) but, if feelings were the progenitor of consciousness, we can understand why it is a unique attribute of the animal kingdom and not found in vegetation or machines.
I’ve argued in a previous post that consciousness evolved early and it arose from emotions, not logic. In particular, early sentient creatures would have relied on fear, pain and desire, as these do pose an evolutionary advantage, especially if memory is also involved. In fact, I’ve argued that consciousness without memory is pretty useless, otherwise the organism (including humans) wouldn’t even know it was conscious (see my post on Afterlife, March 2014).
Many philosophers and scientists argue that AI (Artificial Intelligence) will become sentient. The interesting argument is that ‘we will know’ (referencing New Scientist Editorial, 2 April 2011) because we don’t know that anyone else is conscious either. In other words, the argument goes that if an AI behaves like it’s conscious or sentient, then it must be. However, I argue that AI entities don’t have emotions unless they are programmed artificially to behave like they do – i.e. simulated. And this is a major distinction, if one believes, as I do, that sentience arose from emotions (feelings) and not logic or reason.
But in answer to the question posed above, one only has to look at another very prevalent life form on this planet, which is not sentient, and the answer, I would suggest, becomes obvious. I’m talking about vegetation. And what is the fundamental difference? There is no evolutionary advantage to vegetation having sentience, or, more specifically, having feelings. If a plant was to feel pain or fear, how could it respond? Compared to members of the animal kingdom, it cannot escape the source, because it is literally rooted to the spot. And this is why I believe animals evolved consciousness (sentience by another name) and plants didn’t. Now, there may be degrees of consciousness in animals (we don’t know) but, if feelings were the progenitor of consciousness, we can understand why it is a unique attribute of the animal kingdom and not found in vegetation or machines.
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