INTRODUCTION
External force is needed to make a stationary body move as well as to stop a moving body .
To understand this chapter i . e . Laws of Motion , lets have a quick recap on what we already know about Motion .
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Motion in simple is tendency to move . An object is said to be in motion when it changes its position with time
A body is said to be at Rest if it is not moving
An external force is always involved in motion . This force helps body to perform required actions and these actions are according to rules or laws i . e . Laws of Motion .