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-----Original Message-----Note that in
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.