This is an example of the Second Newton´s Law of Motion.
He formulated three laws. The Second Law of Motion establishes the relation between force, acceleration and therefore velocity.
It states that "The force acting on an object is equal to the mass of that object times its acceleration." This is written in mathematical form as F = ma, where F is force, m is mass, and a is acceleration.
The bold letters indicate that force and acceleration are vector quantities.
On the other hand, the First Law of Motion states that "A body at rest will remain at rest, and a body in motion will remain in motion unless it is acted upon by an external force".
Finally, the Third Law of Motion states that "For every action, there is an equal and opposite reaction".
