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.