Q39 of 124 Page 75

State the law of conservation of momentum.

The law of conservation of momentum states that for any two objects colliding in an isolated system, the total momentum before and after the collision is equal. This is because the momentum lost by one object is equal to the momentum gained by the other.

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38

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

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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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Discuss the conservation of momentum in each of the following cases:

(i) A rocket taking off from ground.


(ii) Flying of a jet airplane.

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If a balloon filled with air and its mouth unties, is released with its mouth in the downward direction, it moves upwards. Why?