A moving bicycle comes to rest after some time if we stop pedaling it. But Newton's first law of motion says that a moving body should continue to move forever unless some external force acts on it. How do you explain the bicycle case?

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Solution

If we stop pedaling then the bicycle comes to rest because of the frictional forces of the ground. The friction force of the ground is an external force which opposes the motion of the bicycle. Hence, after some time the bicycle stops.

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