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Homework Help: Momentum of a System question

  1. Oct 5, 2013 #1
    1. The problem statement, all variables and given/known data
    What has to be true in order for the momentum of a system to be conserved?

    2. Relevant equations

    3. The attempt at a solution
    I am thinking the net force needs to be zero.

    Just wanting to confirm this is correct.

    Thanks in advance
  2. jcsd
  3. Oct 5, 2013 #2


    User Avatar
    Science Advisor
    Gold Member

    In order for the total momentum of a system to be conserved, the net force on that system must be zero. In order for the total angular momentum to be conserved, the net torque must be zero.
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