This document summarizes Sir Isaac Newton's three Laws of Motion and the Law of Universal Gravitation. It explains that the first law states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force. The second law states that the acceleration of an object depends on its mass and the applied force. The third law states that for every action there is an equal and opposite reaction. It also describes gravity as the force that attracts objects toward Earth's center and explains how gravitational attraction depends on mass and distance between objects.