State Newton's laws of motion .

Explanation

3 Physical law describes the relationship between a body and the forces .
(i) Newton's First law : Every body continues to be in its state of rest or the state of uniform motion along a straight line unless it is acted upon by some external force.
(ii) Newton's second law of motion :
The force acting on a body is directly proportional to the rate of change of linear momentum of the body and the change in momentum takes place in the direction of force .
This law helps us to measure the amount of force. So it is called as "law of force " .
(iii) Newton's third law of motion : For every action there is an equal and opposite reaction . They always act on two different bodies .