Q38 of 124 Page 75

State Newton’s third law of motion and give two examples to illustrate the law.

The third law states that all forces between two objects exist in equal magnitude and opposite direction: if one object A exerts a force FA on a second object B, then B simultaneously exerts a force FB on A, and the two forces are equal in magnitude and opposite in direction: FA = −FB


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37

Explain why, a cricket player moves his hands backwards while catching a fast cricket ball.

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A 150 g ball, travelling at 30 m/s, strikes the palm of a player’s hand and is stopped in 0.05 second. Find the force exerted by the ball on the hand.

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Explain why, when a fireman directs a powerful stream of water on a fire from a hose pipe, the hose pipe tends to get backward.

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State the law of conservation of momentum.