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What is inertia?

A : An object tends to carry on doing the same thing, whether it is at rest or moving,unless a force acts on it to change that. This is called inertia. Your pencil box lies on the table until you push it. This state of rest is called inertia of rest. Then, with the force of your finger, it moves on until it meets another force that stops it. This movement is called inertia of motion. If the force you push the object with is too much, it will go beyond the point where you wanted it to go.

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