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Re: [Phys-l] Another tire question



-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of John Denker
Sent: Friday, November 09, 2007 1:06 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] Another tire question


5) Therefore I am mystified by one feature of
http://www.bluffton.edu/~edmistonm/Car.Tires.pdf

I call attention to the red arrows at the 12:00 position. As
we move from the upper row to the bottom row, the red 12:00
arrow gets longer. I don't see how this can be. Among other
things, there is no change in the 12:00 blue arrows, so this
change in the 12:00 red arrows means there is an unbalanced
force, i.e. an out-of-equilibrium situation that cannot
persist.

Note that in
<http://www.bluffton.edu/~edmistonm/Car.Tires.pdf>,
Michael depicted the sidewalls of the tire above the rim as being more
vertical when the car is standing on the pavement than they were when
the car was up on a lift.