Newton's
Three Laws of Motion and his Law of Gravity are probably the most famous of all
physics.
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 an of the
object: F = ma.
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.
