Question

Li and Raj are playing football. They take turns trying to run past each other with the football. Li weighs 125 pound and Raj weighs 175 pounds. Li discovers that if he changes direction quickly when running, he can always dodge out of the way before Raj can tackle him. Why is Li able to avoid Raj’s tackle? Choose the best description. Raj has more mass and therefore more inertia, so he can change his motion more easily than Li. Raj has more mass and therefore less inertia, so he can change his motion more easily than Li. Li has less mass and therefore more inertia, so he can change his motion more easily than Raj. Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.

Answer 1

Answer:

Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.

Explanation:

correct on edge

Answer 2

Answer:

Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.

Explanation:

Inertia describes the resistance of an object to any change in its state of motion, and it depends on the mass of the object only. In particular:

- if an object has a large inertia (large mass), then it is more difficult to change its state of motion (i.e. to put it in motion, or to slow it down, or to change its direction of motion)

- if an object has small inertia (small mass), then it is more easy to change its state of motion

In this problem, Li has less mass than Raj, so he has less inertia, therefore he can change his motion more easily than Raj.