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Changing the Direction of Work

  1. Nov 14, 2014 #1
    If I lift a mass up a certain distance and it creates a positive work quantity, then when I lower the object back down does the work become negative?

  2. jcsd
  3. Nov 14, 2014 #2


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    Science Advisor

    Yes, the work done by your hand on the block as you support it while lowering it is a negative quantity.

    (The vector dot product of a force in one direction and a displacement in the opposite direction is negative)
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