Question

6. Give reason for the following:
(a) When a bus at rest starts suddenly, a standing passenger tends to fall backward.
(b) A cricketer lowers his hands while catching a ball.
(A-53)​

Answer 1

(a) When a bus at rest starts suddenly, a standing passenger tends to fall backward.

When the bus starts suddenly, then, the lower part of body starts being in motion because it is in touch of bus in motion, while the upper part of body tries to be at rest for sometime, because of inertia at rest. this is why, passengers tends to fall backwards when it starts suddenly.

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(b) A cricketer lowers his hands while catching a ball.

While catching a ball, a cricket player lowers his hands, because by doing so, he increases the time of catch. That is, the person increases the time to bring about a given change in momentum, and hence rate of change of momentum decreases. Thus, a small force is exerted by ball on the hands.