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Re: When Physical Intuition Fails



I like to think of the rotational/translational interplay in this
problem -when there is no slipping - as a variant of our old friend: the
skater pushing off from a rigid wall. In both cases the point of
application of the accelerating force is momentarily at rest - this force
is not the source of any energy transfer. But the integral of this force
over the system C.M is a numerical measure of the energy transferred (from
elsewhere) to the CM translational motion. In the case of the skater the
energy source is body metabolism - in the case of the spinning disk energy
is taken from the disk's rotational motion. In both cases some of the
transferred energy is dissipated in non-kinetic forms.

Bob Sciamanda (W3NLV)
Physics, Edinboro Univ of PA (em)
trebor@velocity.net
http://www.velocity.net/~trebor
----- Original Message -----
From: "John S. Denker" <jsd@MONMOUTH.COM>
To: <PHYS-L@lists.nau.edu>
Sent: Saturday, November 02, 2002 1:26 PM
Subject: Re: When Physical Intuition Fails


|
| It seems to me that this skidding-wheel problem bears
| many similarities to the rail-car coupling problem and
| to the ballistic-pendulum problem ... and can be (and
| should be) attacked in the same way.
| http://lists.nau.edu/cgi-bin/wa?A2=ind9911&L=phys-l&P=R37089


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This posting is the position of the writer, not that of SUNY-BSC, NAU or the AAPT.