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Answers
Explanation:
Q1.why do passengers fall forward when a running bus suddenly stops?
Ans-When the driver of a bus applies brake suddenly, the lower part of the body comes to rest as the bus comes to rest but, the upper part of the body continues to move forward due to inertia of motion. As a result, a forward force is exerted on the body and we fall in the forward direction.
Q2.Out of one stone and same sized ball whose inertia will be larger?
Ans-The greater is the mass of the body; the greater is its inertia and vice-versa. The mass of a stone is more than the mass of a rubber ball for the same size. Hence, the inertia of the stone is greater than that of a rubber ball.
Q3.Why do long jump runner jump on sand or in hole pit?
Ans-Athlete 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.
Q4.Why do we tie the luggage kept on an us or a car
Ans-A luggage is usually tied with a rope on the roof of buses. When a moving bus suddenly stops, the luggage on its roof tends to continue in the state of motion due to inertia of motion. Thus, to avoid the falling of the luggage, it is tied with a rope on the roof of a bus.
Q5.Why does a cricket fielder bends his hands backwards while catching the ball
Ans-While catching a fast moving cricket ball, a fielder in the ground gradually pulls back his hand back with the moving ball. In doing so, he experiences a smaller force for a longer interval of time to catch the ball, resulting in a lesser impulse on his hands and hence it will not hurt the hands of the fielder.