Newton's First Law of Motion (Law of Inertia ) :
Every object continues in a state of rest of uniform speed in a straight line unless acted on by a nonzero force.
Newton's Second Law of Motion :
The relationship between an object's mass m, its acceleration a, and the applied force F is,F=ma.
Newton's Third Law of Motion :
For every action there is an equal and opposite reaction.
Impulse is the product of a net external force and time.
(Units are N s or Kgm/s).
SI unit of impulse :N.s =(kg:m/s^2).s=kg.m/s.