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[Phys-L] Re: A Third law question

The accelerating disk both moves AND deforms. If it was constrained so
that it could not move (macroscopically), then it could deform even more,
but any time that it exerts a contact force, it deforms. If it was in
free fall, then it would not be deformed.

Daniel Crowe
Oklahoma School of Science and Mathematics
Ardmore Regional Center
dcrowe@sotc.org

On Wed, 12 Oct 2005 17:41:04 -0400, Jeff Weitz <weitz@PIPELINE.COM> wrote,
in part:

I also appreciate the discussion about deformation and how things push
back. I think that works when talking about a wall, but might be harder
for a student to grasp when talking about accelerating a disk, which
moves rather than deforms.