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Work energy principle vs newtons law

  1. Mar 16, 2010 #1
    Why do we choose to use the work energy principle instead of the Newtons law to analyze the motion of a system of rigid bodies?
  2. jcsd
  3. Mar 16, 2010 #2


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    Science Advisor

    Both principles work in every case. That is, there is always conservation of momentum and energy. Sometimes, it makes more sense (read, easier) to solve a particular problem in a certain way.
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