Newton's Laws of Motion

Physical Laws
Newton's laws of motion are a set of three physical laws that form the basis for classical mechanics.

Newton's First Law

 * Every body remains in a state of constant velocity unless it is acted upon by an external unbalanced force.

Newton's Second Law

 * The total force applied on a body is equal to the derivative with respect to time of the linear momentum of the body.

Newton's Third Law

 * To every force there is always an equal and opposite force. That is, the forces of two bodies on each other are always equal and are directed in opposite directions.