This document summarizes Newton's three laws of motion and introduces concepts of weight, normal force, and tension. Newton's first law states that an object at rest or in motion will remain that way unless acted on by an outside force. The second law relates force, mass, and acceleration. The third law states that for every action there is an equal and opposite reaction. Weight is the force needed to balance gravity, normal force acts perpendicular to surfaces in contact, and tension is the pulling force along a taut cord. Examples apply these concepts to problems involving forces on objects.