Q1. Justify the following statements
a. A fielder in the ground gradually pulls his hand backwards with the moving
ball.
b. A karate player breaks a slab of ice with a single blow
c. When a motor car takes a sharp turn at a high speed, we tend to get
thrown to one side
Answers
Answer:
a) A cricket player moves his hands backwards on catching a fast cricket ball to prevent injury to the hands.
Reason:
--->A fast moving cricket ball has a larger momentum .The momentum of the ball has to be reduced to zero in order to catch .
---->When cricket player moves his hands back , the time taken to reduce the momentum of the ball to zero is increased.
----> Due to more time taken to stop the ball, the rate of change of momentum of ball is reduced and hence a small force is exerted on the hands of players. So, the hands of player do not get hurt.
--->If the cricket player stops the fast moving ball suddenly, then large momentum of the ball will be reduced to zero in a very short time , due to which the rate of change of momentum of ball will very large which will exert a large impact force on player's hand causing the injury to his hands.
Conclusion:
To prevent injury to his hands, always a cricket player moves his hands backwards on catching a fast cricket ball
b) Karate player is able to break a pile of tiles and also ices slabs with the single blow of his hand. He strikes the pile with his hand very fast .
The who entire momentum of the fast moving hand is reduce to zero in very short time therefore the student can collect the right answer for question in the fine manner.
c) When the motor car takes a sharp turn at high speed, the passengers tend to get thrown to one side.
It is because the body of the passengers tries for resisting the change exactly in the side of inertia.
Hence, the passengers will slip for getting to one side of a car.
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