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Homework Help: % Energy lost due to friction

  1. Oct 2, 2011 #1
    Can the % of Energy lost due to friction be negative? Or is it always positive?
  2. jcsd
  3. Oct 2, 2011 #2
    It is always positive. A negative loss is an addition and if that were the case, we would all have infinite motion machines that produce energy via friction. A nice idea, but impossible.

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