Question

The inertia of a body is the quantitative measure of its:

• A. Velocity
• B. Acceleration
• C. Mass
• D. Force

Answer 1

The correct option is C

Mass

Explanation for correct option:
Option C:

1. Inertia: It can be defined as the tendency of an object to continue its state of rest or of uniform motion until or unless an external force is applied to it.
2. The object resists any change in its state of rest or motion. When we apply sudden brakes on a bus, the passengers move forward because of inertia.
3. The quantitative measure of the inertia of a body is mass, which governs its resistance to the action of a force.
4. The mass of a body is a measure of inertia of the body in linear motion.
5. In other words, the inertia of a body is a quantitative measure of its mass.

Explanation for incorrect options:
Option A:

Velocity is not related to inertia. So it is not a measure of inertia.
Option B:

Inertia has nothing to do with acceleration. So this option is incorrect.

Option D:
Force is not a measure of inertia. So this is the wrong option.

Hence, option C is the correct answer.