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  • A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to (a) exert larger force on the ball (b) reduce the force exerted by the ball on hands

A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to:

(a) exert larger force on the ball
(b) reduce the force exerted by the ball on hands
(c) increase the rate of change of momentum
(d) decrease the rate of change of momentum

Answers (1)

Ans. b

Sol.

We know that force is equal to the rate of change of momentum. When a moving ball is caught by the goalkeeper, ultimately it stops. It means the change in momentum of the ball will be same whether he catches the ball directly or by moving his hands backwards. By moving his hand backwards during the catch, he gives more time to change the momentum of the ball. This process ensures minimum acceleration, hence the force will be minimum by the goalkeeper on the ball. The law of action-reaction says that the force on the goalkeeper by the ball will also be minimum.

Correct option is B.

 

Posted by

Gurleen Kaur

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