Question

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Explain why: (a) It is easier to pull a lawn mower than to push it. (b) A cricketer moves his hands backwards while holding a catch.
Carries 3 Marks
Class 11 CBSE

Answer 1

Answer:

(a) Due to change in effective weight

When we pull the lawn mower The Weight gets balanced by the Perpendicular component of Force of Pulling acting upward. As a result, the weight decreases.

When we push a lawn mower The Weight is increased due to The Perpendicular component of Force acting downward. As a result, the weight increases.

(b) As Force is DIRECTLY proportional to

Change in Momentum/Time

So, if Time somehow increases the Momentum will automatically decrease [ eg - 10/2 N > 10/5 N ]

So the player, to catch the ball easily, lowers his hand down.Also, it helps him not to get injured or miss the catch.

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