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Chapter 7: Q3Q (page 170)

When a person jumps from a tree to the ground, what happens to the momentum of the person upon striking the ground?

Short Answer

Expert verified

The momentum of the person upon striking the ground will become zero.

Step by step solution

01

Conservation of momentum

According to the law of conservation of linear momentum, if no external force acts on the system, the momentum of a system remains conserved.

For example, consider a system of two objects which collide head-on. If no external force acts on the system, the total momentum of the system before collision will be equal to the total momentum after the collision.

02

Determining the momentum of the person on striking the ground

When a person jumps from the tree to the ground, it strikes the ground. Consider the collision of person on the ground (earth). The momentum of a person keeps on changing during the jump. The velocity of the person will become zero on striking the ground. Therefore, the momentum of the person will become zero.

The momentum of the person will get transferred to the ground. Since the earth is a massive object, its velocity will be very low, which cannot be noted.

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Most popular questions from this chapter

Billiard balls A and B, of equal mass, move at right angles and meet at the origin of an xy coordinate system as shown in Fig. 7鈥�36. Initially ball A is moving along the y axis at \({\bf{ + 2}}{\bf{.0}}\;{\bf{m/s}}\), and ball B is moving to the right along the x axis with speed \({\bf{ + 3}}{\bf{.7}}\;{\bf{m/s}}\).After the collision (assumed elastic), ball B is moving along the positive y axis (Fig. 7鈥�36) with velocity What is the final direction of ball A, and what are the speeds of the two balls?

FIGURE 7-36

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