On 25/06/18 10:58, Huge wrote:
On 2018-06-25, Andy Burns wrote:
Dave Plowman wrote:

Huge wrote:

The - Bits - Of - The - Tyre - Not - In - Contact - With - The - Road -
Are - Irrelevant. The - Only - Thing - That - Matters - Is - The -
Diameter - Of - The - Circle - Whose - Radius - Is - The - Distance -
From - The - Axle - To. The - Road.

You should have used caps, Huge. For those whose physics are still at
kindergarten level.

Except there isn't a single distance from the centre of the axle to all
parts of the tyre in contact with the road ... the average distance perhaps?

Oh, FFS. This is really, really simple. Why are you all making it so
complicated? (It's the *shortest* distance, obviously. Just draw a bloody
diagram.)


Because it is not simple. Only you are simple. It is in fact fiendishly
complicated. And the short cut is to forget radius and think only of
circumgference If you think in terms of radius you will get it all wrong

Because the rim of the wheel is moving slower than you think, because
the tyre is flexing as it goes round.





--
In a Time of Universal Deceit, Telling the Truth Is a Revolutionary Act.

- George Orwell