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# Which law of Newton defines the inertial Frame of Reference?A) First law of motionB) Second law of motionC) Third law of motionD) Law of Gravitation

Last updated date: 17th Sep 2024
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Hint: There are three laws of motion proposed by Newton. They correspond to the inertia of a body, force acting on or by the body and mutual forces. Law of gravitation is also an important theorem by Newton describing the relation of gravitational force between two bodies, but it is not a part of the three laws of motion.

What is inertia? Well, inertia is a property of any object by virtue of which it resists any change in its motion, whether it is in rest or in uniform motion.

Inertial frame of reference simply means a frame in which a body stays in continuous motion or rest.

Newton’s First Law of Motion states that, “Every body continues in its state of rest or in uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it.”

This means that a body does not break its inertia until acted on by an unbalanced external force. To illustrate this by an example, when we travel in a bus at a certain velocity, we are then experiencing inertia of uniform motion or simply, motion. But when brakes are applied suddenly, we move forward, conserving that inertia of motion.

Thus the correct answer is (A), First law of motion.