First, the statements of NewtonĊ Laws:
1. First Law: Every body persists in its state of uniform motion in a straight line or of rest forever unless compelled to change so by the action of an impressed force.
2. Second Law: The magnitude of the applied force is equal to the time rate of change of linear momentum and the direction of the force is same as that of the change in momentum.
3. Third Law: Every action action has equal and opposite reaction.
Discussion:
The first law defines force. Force is an influence that can change the state of motion of an object. For zero applied force the state of motion remains unchanged. The second law simply gives the magnitude and the direction of the force. It is written in mathematical form using differential calculus in the following manner:
\frac{d\bf{p}}{dt} = \bf{F}
