This document discusses 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 with the same speed and in the same direction unless acted upon by an unbalanced force. Newton's second law relates 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 specifies that for every action, there is an equal and opposite reaction. The document is about Newton's laws of motion in a physical science class.