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Answers
Answer:
1 ) This is because of Inertia
Explanation:
1 ) While you are travelling in a bus or in a car , when a sudden brake is applied , the upper part of your body leans in the forward direction . This is due to any body would like to continue to be in the state of rest or the state of motion . This is known as "Inertia" . The inherent property of a body to resist any change in its state of rest or the state of uniform motion , unless it is acted upon by an external unbalanced force is known as Inertia .
5 ) In cricket , a fielder pulls back his hands while catching the ball this is because he experiences a smaller force for a longer interval of time to catch the ball resulting in a lesser impulse on his hands . Further as the time increases the rate of change in momentum decreases and the force acting on his hands is reduced .
Force = momentum / Time
i) When a moving bus brakes to a stop, our feet come to rest with the bus. But upper part of our body continues to move forward on account of inertia of motion. That is why we tend to fall in the forward direction.
ii) The mass of a stone is more than the mass of a ball for the same size. Hence, the inertia of the stone is greater than that of a ball.
iii ) Long jump runner is made to land on the sand after long jump so as to increase the time of impact. This reduces the momentum and force by which he is landing on the ground. Thus, athlete is saved from getting injured.
iv) If any luggage kept on the roof of the bus is not tied with a rope, then it tends to move forward due to its inertia. In this process, it could fall off the bus.
v) 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.
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