It is the inertia of the body which describes the existing state of rest or uniform motion in a straight line.
What is inertia?
The inertia of the body is defined as If the body is at rest then it will be at the same state until an external force is not applied to it.
Similarly, If the body is in motion then it will remain in motion until and unless an external effort is not applied to stop it.
For example, if the football is placed at the rest on the ground it will never move from the same position until an external force is not applied.
Similarly, if the car is moving at a certain speed then it will only stop if the brakes are applied and if there is not any friction it will never stop.
Thus the inertia of the body describes the existing state of rest or uniform motion in a straight line.
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