When is friction a potential problem for applying conservation of momentum to a system?

Name: When is friction a potential problem for applying conservation of momentum to a system?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Friction as an external interaction can introduce an external force to the system, violating the condition for the conservation of momentum which requires that no external forces act on the system. Conservation of momentum applies only when the net external force on a system is zero.

When Is Friction a Potential Problem for Applying Conservation of Momentum