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Re: MOMENT OF INERTIA

(4) Bob Carlson presented a number of examples to show that
a frictional force can do positive work. These are good
counter examples to a common misconception that friction
forces do only negative work (as when they stop motion).

I am utterly unable to see how friction can do positive work on a body.
Friction (kinetic friction) always acts opposite to velocity. Thus
slowing it down. I missed the early part of this thread, but there has
to be some confusion here.

J. Epstein