Q21 of 124 Page 55

Explain how, a karate player can break a pile of tiles with a single blow of his hand.

In doing so, the entire momentum of the hand is reduced to zero in very short interval of time. As a result, very large force is delivered to the pile of tiles which breaks it in a single blow.


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19

Explain why, it is easier to stop a tennis ball than a cricket ball moving with the same speed.

 20

Explain the meaning of the following equation:

P = m × v


Where symbol have their usual meaning

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Calculate the momentum of a toy car of mass 200 g moving with a speed of 5 m/s.

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What is the change in momentum of a car weighing 1500 kg when its speed increases from 36 km/h to 72 km/h uniformly?