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Re: Work done by Friction





Jerome Epstein wrote:

I am quite puzzled as to what the controversy is here. Friction exerts a
force along the line of motion and therefore does work -- actually work
is done against friction (at the expense of the kinetic energy
generally).
J. Epstein



Hi,

I think at this point, an adjective is needed. Something like
"kinetic", "dynamic", "sliding" before "friction" If it is static
friction, work is still being done through the interactive force of
friction.

Thanks
Roger Haar