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Second Law of Motion

A brick can b...

Question

A brick can be pushed gently on the smooth floor by applying force without foot.But if we kick the brick the foot is hurt.Why?

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Solution

When we kick a brick ,time for which the force imparted is short.
Therefore, rate of change of momentum of the brick is large.
So, a large reaction force is exerted back by the brick on the foot, hence the foot is hurt.

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