Q38 of 124 Page 75

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.

The water from the house pipe rushes out with great speed in forward direction (action of house pipe on water).Then due to Newton's 3rd law of motion the house pipe moves in backward direction as a reaction.


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37

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.

 38

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

 39

State the law of conservation of momentum.

 39

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

(i) A rocket taking off from ground.


(ii) Flying of a jet airplane.