This document explains Isaac Newton's three laws of motion through examples and diagrams. Newton's First Law states that objects at rest stay at rest and objects in motion stay in motion unless acted upon by an unbalanced force. Friction and gravity are examples of forces that cause moving objects to eventually stop. Newton's Second Law states that force equals mass times acceleration (F=ma). Newton's Third Law says that for every action there is an equal and opposite reaction - when one object exerts a force on a second object, the second object exerts an equal force back on the first.