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Conservation of Momentum (Generalized Question)

  • Thread starter NY152
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1. Homework Statement
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. Homework Equations


3. The Attempt at a Solution
 

PeroK

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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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