# Newtons Laws of motions

## First Law of motion

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 – see below.)

## 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
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