Chapter 8, Problem 12A

Visualize yourself on a skateboard.

a. When you throw a balk, do you experience an impulse?

b. Do you experience an impulse when you catch a ball of the same speed?

c. Do you experience an impulse when you catch it and theu throw it out again?

d. Which impulse is greatest?

To determine

To identify: Whether an impulse will be experienced or not when a ball is thrown.

Answer to Problem 12A

The person will experience an impulse while throwing a ball.

Explanation of Solution

Introduction:

The impulse momentum which is required to bring the moving object to a stop and then throwing it back again, is more than the impulse needed to just stop the same moving object.

An additional impulse force is required to throw the ball.This is because while throwing the ball, the person applies a force on the ball and on the other hand a force also acts on the person too. This force acting on the person has an impulse.

Conclusion:

Thus, the person experiences an impulse when throwing a ball.

To determine

To identify: Whether an impulse will be experienced or not when a person catches a ball of the same speed.

Answer to Problem 12A

The person experiences an impulse while catching a ball of the same speed.

Explanation of Solution

Introduction:

The impulse which is needed to bring a moving object to a halt and then throwing it again is always higher than the impulse needed for just bringing the object to halt.

Consider the person has to catch a moving ball by his hand, then the person has to an impulse in order to minimize the ball’s momentum to zero.

Hence, the person experiences an impulse while catch a ball of the same speed.

Conclusion:

Thus, the person experiences an impulse while catching a ball of the same speed.

To determine

To identify: Whether an impulse will be experienced or not when a person catches a ball and throw it out again.

Answer to Problem 12A

The person experiences an impulse when catch it and throw it out again.

Explanation of Solution

Introduction:

The impulse which is needed to bring a moving object to a halt and then throwing it again is always higher than the impulse needed for just bringing the object to halt.

Consider a person has to catch the ball and throw it again.

In that case, it requires more impulse to catch the ball and throw it back up than merely to catch it.

Hence, the person experiences an impulse when catching it and throwing it out again.

Conclusion:

Thus, the person experiences an impulse when catch it and throw it out again.

To determine

To identify:The situation when a person will experience greater impulse from part (a), (b) and (c).

Answer to Problem 12A

An impulse when catch it and throw it out again is greater.

Explanation of Solution

Introduction:

The impulse that is required to stop an object and then throw it back again will be greater than the impulse required merely to stop an object.

From part (a), an impulse will be experience by a person while throwing a ball.

From part (b), an impulse will be experience by the person while catching a ball with the same speed.

From part (c), an impulse will be experience by the person while catchinga ball and then throw it out again.

From the above results, it is observed that the impulse provided by the person while catching a ball and then throwing it again is greater.

Conclusion:

Thus, an impulse when catch it and throw it out again is greater.