Momentum of a System question

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Homework Statement


What has to be true in order for the momentum of a system to be conserved?


Homework Equations





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
 

Answers and Replies

  • #2
jfizzix
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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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