Define inertia of rest and inertia of motion
Answers
The tendency of a body at rest to remain at rest, or of a body in motion to continue moving in a straight line at a constant speed unless a force is applied to it. Mass is a measure of a body's inertia.
When a stalled motor or train suddenly stops, the passengers sitting in it fall backwards, this is because the lower part of the passenger's body is in contact with the vehicle, that is nothing but INERTIA and its types.
Explanation:
The tendency of things that they cannot automatically change their state of rest or motion is called inertia. For this reason, Galileo's law is also called inertia law. There are two types of inertia -
(i) Inertia of rest: If an object is in resting state, it will always remain in rest until its state of rest is changed by applying an external force on it.
(ii) Inertia of motion: If an object is moving in a straight line at the same speed, it will continue to move in the same manner, unless its state of motion is changed by applying an external force on it.
In this way, force is the external factor by which the state of pause or speed of an object changes.
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