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Symmetry and newton's laws

  1. Feb 20, 2007 #1
    Is it possible to show directly from Newton's Laws that conservation of momentum and energy follow from principles of symmetry?
  2. jcsd
  3. Feb 20, 2007 #2


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  4. Feb 20, 2007 #3


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    I think you also need to postulate that there is some variational principle. After all, frictional systems can be time invariant, and nevertheless, there is no conservation of energy.
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