Newton's laws of motion are three physical laws which provide relationships between the forces acting on a body and the motion of the body.
They were first compiled by Sir Isaac Newton in his work Philosophiae Naturalis Principia Mathematica (1687).
The laws form the basis for classical mechanics and Newton himself used them to explain many results concerning the motion of physical objects.
Traditional brief statements of the three laws:
A physical body will remain at rest, or continue to move at a constant velocity, unless an outside net force acts upon it.
Rate of change of momentum is proportional to the resultant force producing it and takes place in the direction of that force.
To every action there is an equal and opposite reaction.