Question

Explain the following briefly:

(i) A cricket ball causes much severe injury than a tennis ball on hitting a spectator.

(ii) An applied unbalanced force causes a change in momentum.​

Answer 1

Explanation:

As the momentum is more, change in momentum will be also more, so when the cricket ball hits the spectator, the final momentum becomes zero and hence the impact force of the cricket ball is more on hitting a spectator than tennis ball. Unbalanced forces causes acceleration.Oct 3, 2017.

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Answer 2

The explanations of the following are as follows:

(i) A cricket ball causes much severe injury than a tennis ball on hitting a spectator because:

- A cricket ball has larger mass than the tennis ball.

- So, its momentum will be more.

- Therefore, it will have greater impulse and hence it causes much severe injury than a tennis ball.

(ii) An applied unbalanced force causes a change in momentum because:

- On the application of an unbalanced force, acceleration is produced in a body.

- It means that the velocity of the object changes and hence its momentum also changes.