3
AssignmentMultiple Choice

Lesson 2: Newton's First and Third Laws

Question 3 • POP Physics 26/27

Why is Li able to avoid Raj’s tackle? Choose the best description.

Answer
A
Raj has more mass and therefore more inertia, so he can change his motion more easily than Li.
B
Raj has more mass and therefore less inertia, so he can change his motion more easily than Li.
C
Li has less mass and therefore more inertia, so he can change his motion more easily than Raj.
D
Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.

Explanation

Inertia is an object's resistance to changes in its motion, and an object's mass measures its inertia. Because Li has less mass, Li has less inertia and can change direction more easily than Raj. Therefore, the best description is that Li has less mass and less inertia.

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