1. Three Laws of Motion

2. NEWTON’S THREE LAWS OF MOTION

3. NEWTON’S FIRST LAW A BODY AT REST REMAINS AT REST AND A BODY IN MOTION REMAINS IN UNIFORM MOTION IN A STRAIGHT LINE UNLESS ACTED ON BY AN EXTERNAL UNBALANCED FORCE

4. Newton’s First Law Explained Experience tells us that a stationary object remains at rest unless acted on by some outside force. We know that forces are necessary to cause anything to move if it is originally at rest.

6. NEWTON’S SECOND LAW The acceleration a of an object in the direction of a resultant force F , is directly proportional to the magnitude of the force and inversely proportional to the mass m

8. Newton’s Second Law Explained! The Law of Acceleration: Experience tells us that larger and larger resultant forces on the same object will result in greater and greater changes in the velocity of the object. F 2F a 2a

9. Furthermore: If we keep the resultant force constant and apply it to greater and greater masses, the change in velocity decreases. The change in velocity per init time is defined as its acceleration a . He demonstrated the direct relationship between the applied force and the resulting acceleration. He showed that the acceleration decreased proportionally with the inertia or mass of the object. a = — or F = ma F m

10. m 2m 3m F F F a ½ a CONSTANT FORCE INCREASING MASS RESULTS IN DECREASING VELOCITY ? 1. 2. 3. What would be the acceleration of no. 3?

12. NEWTON’S THIRD LAW FOR EVERY ACTION THERE MUST BE AN EQUAL AND OPPOSITE REACTION FORCE

14. Illustrating the 3 rd Law of Motion The wheels of the car push on the road. The road pushes the wheels of the car. ACTION FORCE: REACTION FORCE: