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Homework Help: Conservation of Momentum (Generalized Question)

  1. Nov 13, 2016 #1
    1. The problem statement, all variables and given/known data
    Will momentum not be conserved in the case of a free fall because gravity is considered an external force? Is this because the system is not isolated? If this is the case, I understand the concept now, but could someone give me another example of an external force that will impact momentum in a way in which it wouldn't be conserved?
    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Nov 13, 2016 #2


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    Any ball sport. E.g. a system of two tennis players, their rackets and the ball. Perhaps consider only horizontal momentum to take out the effect of gravity.
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