APPLIED SYSTEMS NEWTON'S LAWS OF MOTION An object in motion tends to stay in motion. Every action has an equal and opposite reaction. Motion continues unless there is resistance. These laws continued to be seen as having universal relevance until Quantum Mechanics came along, and determined the laws to be different at different scales. Nonetheless, Newton's Laws of Motion tend to remain accurate at what we call intermediate scales, or some say, above the atomic level.               BACK TO SYSTEMS