Source: https://en.wikipedia.org/wiki/Newton%27s_laws_of_motion
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 forces F on an object is equal to the mass m of that object multiplied by the acceleration a of the object: . (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.
Since "newton" is , and according to Newton's second law, therefore
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