This document discusses Sir Isaac Newton's three laws of motion. Newton published his laws in his 1687 book "Philosophiae Naturalis Principia Mathematica", establishing the laws of classical mechanics. The laws state that 1) an object at rest stays at rest and an object in motion stays in motion unless acted upon by an unbalanced force, 2) the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, and 3) for every action, there is an equal and opposite reaction. Examples are provided to help explain each law, such as tug of war demonstrating balanced forces, and kicking a soccer ball to impart unbalanced force. Key terms like inertia, acceleration, and