Laws of Motion

The laws of motion are Newton's three fundamental principles that describe how forces affect the motion of objects. They explain why objects stay at rest or keep moving, how force, mass and acceleration are related, and…

• Newton's first law: an object remains at rest or in uniform motion unless acted on by a net external force.
• Inertia is the tendency of a body to resist change in its state of motion.
• Mass is the quantitative measure of inertia.

Full explanation, worked examples & memory tricks in the app