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Is there are power involved?

  1. Dec 5, 2008 #1
    For example,
    if you are going to the gym and lift a 5kg weight and you lift it till you wrist level and stop moving. Does your body lose/exerts energy during the interval when you are not moving?
    And is there are power involved?
  2. jcsd
  3. Dec 5, 2008 #2


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    Science Advisor

    Re: weight

    Yes, one "uses" energy to hold the weight.

    No, since there is no displacement, no work is done. Note that "effort" and "work" are not the same thing.

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