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. Friction is a net force that causes objects to slow down and stop due to contact between surfaces. According to Newton's First Law, without friction or gravity, objects would continue moving indefinitely. The net force on an object is calculated by adding all individual forces acting on it; if the forces balance out the net force is zero and there is no change in motion, while an unbalanced net force will cause acceleration or a change in speed or direction of motion.
![I. Newton’s First Law ,[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)