Q40 of 124 Page 75

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

It moves in the upwards direction because according to Newton's third law of motion EVERY ACTION HAS IT'S OPPOSITE AND EQUAL REACTION and therefore when the air starts coming out from the mouth of the balloon(ACTION) in the downward direction, as a reaction the balloon moves upward .


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39

State the law of conservation of momentum.

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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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The rocket work on the principle of conservation of:

A. Mass B. Energy


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