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CONSERVATION OF ENERGY



On 12 Jul 1997 al clark <al@sci.nccu.edu> wrote:

As I understand it, work is not done by the kinetic energy. Rather the
force of friction, acting in the block, does work, the effect of which
is to reduce the kinetic energy of the block ...

Would the saying "work done at the expense of kinetic energy" beacceptable?
Why? Why not?