A ball rolling on the ground stops on its own after some time. Why?
The ball is stopped by an external force.
The force of friction acts against the motion of the ball.
The ball moves only for a set period of time.
None of the above
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Correct option is B)
The force of friction acts between the two surfaces by opposing the relative motion of one surface over the other. For example, when the ball rolls on the ground, the force of friction acts between the surface of the ball and the surface of the ground. The irregularities between the two surfaces lock into each other and thus, stop the ball from moving any further unless it is moved by an external force.