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Re: MOMENT OF INERTIA



On Sat, 19 Dec 1998, John Mallinckrodt wrote:

Using the most commonly held notion of work and the most obvious reference
frame, I think most of us would agree that static friction does positive
work on--and thereby "increases the speed of"--a box resting on the flat
bed of an accelerating truck.

Of course I should have simply added that, if the box begins slipping
while the truck is accelerating, then it is *kinetic* friction that takes
over doing the (still positive) work!

John
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A. John Mallinckrodt http://www.csupomona.edu/~ajm
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