Newton's three laws of motion may be stated as follows:


First law: In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force.

Second law: In an inertial frame of reference, the vector sum of the forces F on an object is equal to the mass m of that object multiplied by the acceleration a of the object: F = ma. (It is assumed here that the mass m is constant)

Third law: When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.

In summary, Newton's laws boil down to (f=ma) . An enormous quantity of physical science has been developed by applying this simple B.1 mathematical law to different physical situation.