Question: A pool ball that is struck gently will roll smoothly across the felt surface of a pool table. However, it is possible to strike the

A pool ball that is struck gently will roll smoothly across the felt surface of a pool table. However, it is possible to strike the ball in a way that produces "backspin", such that the ball is rotating in the opposite direction to its normal rolling motion as it moves across the table. Describe the nature of the friction force between the table and the ball in these two cases in terms of static or kinetic friction.

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