We still don’t really know how bicycles work

Forget mysterious dark matter and the inexplicable accelerating expansion of the universe; the bicycle represents a far more embarrassing hole in the accomplishments of physics.

Let’s be honest, a bit of the pleasure at Chris Froome’s victory in the Tour de France is down to this being our second victory in a row and to the thought that the French haven’t won it since 1985. What must be worse for them, though, is that when it comes to the science of team cycling, even the Belgians are in front.
 
At the University of Mons, researchers are developing something called the Anaconda. It’s never going to be much of a speed machine because it is, in effect, a chain of monocycles with handlebars. These units are connected, by means of hinges that allow them to snake along, to a normal two-wheeled bike at the front. Every rider in the chain can be going in a slightly different direction, which means it takes an enormous amount of control and collaboration to move the thing forward. According to Olivier Verlinden, chief engineer on the project, the main qualification for riders is to be unafraid of falling off.
 
It’s fun, apparently. The idea is to unleash it as a beach-resort bike, the kind of thing that stag and hen parties will use to terrorise seaside towns across the world. But it is also scientifically interesting. Why? Because we still don’t really know how bicycles work.
 
It is rare that most people appreciate the bicycle, but it is quite an extraordinary machine. Push a riderless bike, letting it roll freely at high enough speeds, and it can withstand pushes from the side – it will wobble a little, but quickly recover. In the conventional analysis, that is because the gyroscopic force of the front wheel, its mass and the spontaneous turn of the handlebars all act together to keep the bicycle rolling forwards. This has something to do with the gyroscopic effect, the force that keeps a spinning top upright. You can feel this by removing a wheel from your pushbike and spinning it while you hold the axle spindles. If you try to change the orientation of the wheel, you’ll feel it push back against you.
 
The first mathematical analysis of bicycles suggested that this is also what keeps a moving bike on its wheels. But although the equations were written down in 1910, physicists always had nagging doubts about whether this was the whole story.
 
The most definitive analysis came exactly a century later. It involved an experimental bicycle that had all its gyroscopic effects cancelled out by a system of counter-rotating wheels. The effort of building such a strange contraption was worth it: the resulting paper was published the prestigious journal Science.
 
The publication plunged bicycle dynamics back into chaos. It turns out that taking into account the angles of the headset and the forks, the distribution of weight and the handlebar turn, the gyroscopic effects are not enough to keep a bike upright after all. What does? We simply don’t know. Forget mysterious dark matter and the inexplicable accelerating expansion of the universe; the bicycle represents a far more embarrassing hole in the accomplishments of physics.
 
And it may not be solved any time soon; very few researchers are working full-time on bicycle dynamics and there’s very little money in it. Once we’ve discovered exactly how these contraptions work, it might be possible to come up with bold new designs of bicycle – perhaps even better than the Anaconda. But nobody is desperate for that to happen; not even the French.
 
Maybe that’s OK. In an age where we have worked out the history of the cosmos and the secret of life, it’s rather nice that the humble bicycle keeps our feet on the ground. 
 
Cyclists during the Tour de France. Photo: Getty

Michael Brooks holds a PhD in quantum physics. He writes a weekly science column for the New Statesman, and his most recent book is At the Edge of Uncertainty: 11 Discoveries Taking Science by Surprise.

This article first appeared in the 29 July 2013 issue of the New Statesman, Summer Double Issue

Photo: Getty
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On the important issues, Louise Casey all too often has little to say

Far from moving the debate on, this new report on integration adds little to the report I commissioned in 2001. 

For 15 years, “numerous government reports on community cohesion and integration have not been implemented with enough force or consistency” concludes Louise Casey’s review of  integration.  The government’s lukewarm response suggests their effort will be as “diluted and muddled” as all the rest.

There’s a deeper reason why governments shy away from the measures that are needed. The report's wealth of data sets out a stark if sometimes contestable picture of a divided society.  But no amount of data can really bring the lives of our fellow citizens to life. As the Brexit vote underlined, this is now a nation divided by class, geography, education, wealth, opportunity and race. Those divisions colour the way we live our lives, the way we see problems in society, the relations we have with others, and our political choices. The report, like many before it, stops short of setting out that reality. It’s easier to pretend that most of us pretty much agree on most things; but just few people don’t agree and they must be the problem. Predictably, much of the early coverage has focussed on the Muslim community and new migrants. If only it were so easy.

According to Casey “in this country, we take poverty, social exclusion, social justice and social mobility seriously” and we do it “across political divides”. Apparently “creating a fair, just society where everyone can prosper and get on” is a cornerstone of British values. Yet for page after page the report chronicles the serial failure of this benign consensus to tackle educational under-performance, and economic and racial disadvantage. If we all agree, how come we haven't done anything about it?

These problems are not certainly easy to solve, but more lip service is paid to tackling them than effort. The practical material issues documented here need addressing, but punches are pulled when hard answers are needed. Given the dramatic impact of mass migration on cohesion, is integration possible while current rates of immigration persist? Can we find the political will to tackle poverty and disadvantage when those who might benefit from the effort are divided against each other by suspicion, race, geography and values? After all, rather than progressive policies producing a cohesive society, social unity is the precondition for the introduction of progressive policies.

We don't actually actually agree on what our “fundamental values” mean in practice. We can all sign up to democracy and the rule of law, but as soon as those are put into practice – see the court case on Article 50 – we are divided. When judges are popularly seen as “enemies of the people” and a vote in an elected parliament as a threat to democracy, in what sense are law and democracy fundamental?

Casey usefully highlights how treating homeless families equally, irrespective of ethnicity and length of residence can create the perception that minorities are being favoured over long standing residents. Our differing views on what is “just” and how “fairness” are defined can tear us apart. Is it fair to favour the newcomer over the indigenous? Is it just to put length of time on the waiting list above housing need? We often don't even acknowledge the legitimacy of other points of view, let alone try to find common ground.

The continual invocation of Britain and British values lends an air of unreality to the report.  Most people in England include British in their identity, but Englishness and English interests are of growing importance. In a worrying development, some areas of England  may be polarising between a white Englishness and an ethnic minority Britishness. Integration won't happen without a shared national story that combines a unifying national identity with the acceptance that we all have more than one identity that matters to us. Ignoring the reality of complex and multiple identities closes off one essential way forward.

None of this means that the criticism of some reactionary and occasionally dangerous ideas and practices in the Muslim community should be ignored and not confronted. But in a country where the established church opposes homosexual relationships and praise for Vladimir Putin's Russia is now mainstream politics it is hard to believe that all our problems can be reduced to the behaviour of a minority of a minority community.

John Denham was a Labour MP from 1992 to 2015, and a Secretary of State 2007 to 2010. He is Director of the Centre for English Identity and Politics at Winchester University