A ball rolling on the floor eventually slows down and stops. Why?

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A No force is acting
B Friction acts in the opposite direction
C Gravity stops it suddenly
D The ball becomes lighter

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Answer: B. Friction acts in the opposite direction

Friction between the ball and the floor acts opposite to the direction of motion. It slowly reduces the ball's speed until it stops. If no force acted, the ball would keep rolling.

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A ball rolling on the floor eventually slows down and stops. Why?

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