An athlete always runs some distance before taking a jump. Why?
Q.1. An athlete always runs some distance before taking a jump. Why?
Ans. He does so as to gain momentum so that he can jump a longer distance.
Q.2. Define 1 kg weight and express it in newton.
Ans. It is the gravitational force of the earth which acts on a body of mass 1 kg. 1 kg wt = 9.8 N
Q.3. Why is glass or chinaware packed with straw ?
Ans. Glass or chinaware is fragile and so when they are being transported they can break by hitting each other. By using straw their change in momentum is brought about in a longer time so they exert a smaller force.
Q.4. In a high jump athletic event, the athletes are made to fall on a cushioned bed. Why?
Ans. The cushioned bed sinks under the weight due to which the rate of change of momentum is small. This results in lesser force exerted on the ground and the athlete is hurt less.
Q.5. Why is it advised to tie luggage kept on the roof of a bus?
Ans. When a speeding bus stops suddenly, the luggage continues to move forward due to inertia of motion and likely to fall off the bus.
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