1st: any body remains in its state of rest or motion unless acted upon by some external force.
e.g: a ball rolled on the floor continues to roll unless u stop it. it stops because of external force-friction offered by floor, gravitation and air friction
2nd: the rate of change in momentum is directly proportional to applied force and takes the direction in which the force acts.
3rd: every action has an equal and opposite reaction.
e.g: a ball thrown on a wall bounces back due to the opposite and equal force exerted by the wall
1st law
If the obj is at rest it is always at rest, if the object is in motion it is always in motion unless an external unbalanced force acts on it.
2nd law
The external unbalanced force acting on an object is directly proportional to rate of change in momentum.
3rd law
For every action ther is an equal and opposite reaction.