This document summarizes Newton's three laws of motion. Newton's first law states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an external force. Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Newton's third law states that for every action, there is an equal and opposite reaction. This law explains how rockets produce thrust and keeps planets in orbit around the sun through gravitational forces.