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Re: [Phys-l] (no subject)



I think drag racing tires are designed such that if you heat them up,
e.g. by spinning your wheels just before the race, they become sticky
and tend to adhere to the track. I would expect the horizontal
stickiness-related force to be roughly proportional to the contact area
unlike the dry friction force which is independent of contact area.
Jeff Schnick
Manchester, NH

-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of John Clement
Sent: Friday, September 26, 2008 4:07 PM
To: 'Forum for Physics Educators'
Subject: Re: [Phys-l] (no subject)



While the conventional equation for friction is only a first order
empirical
formula, how much deviation is there for racing tires? Actually some
racers
do have a scientific background, and use it in their designs. The
answer
that was given does not give much in the way of clues. As the
pressure
goes
down one would expect that the number of atoms in intimate
contact/area
also
goes down, which makes the classical formula make sense.

John M. Clement
Houston, TX


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