When there is no net force on an object, an object at rest remains at rest, and an object in motion continues to move along a straight line with constant velocity.
We know from the first law, what happens when there is no unbalanced force on an object: its velocity remains constant. Now let us see What happens when there is an unbalanced force on an object ? The Newton's second Law gives the answer to this question, that is, the net force acting on a body will produce an acceleration.
When there is a constant unbalanced force on an object, the object moves with a constant acceleration. Furthermore, if the force varies, the acceleration varies in direct proportion with larger forces producing larger accelerations. Twice the force produces twice the acceleration for the same body.
The magnitude of the acceleration produced depends on the quantity of matter being acted upon. The quantity of matter is referred to as the inertial mass.
Newton’s second law states the relation between the net force and the inertial mass.S = m
If the object exerts a force F on a second, then the second object exerts an equal but oppositely force - F on the first.
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