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Force, Motion and Energy. How do things move?. Above Below Ahead Behind Up Down Horizontally Vertically Right Left. How do we know something has moved?. By looking at the things that are not moving around it. FRAME OF REFERENCE. Speed. What is speed?
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How do things move? • Above • Below • Ahead • Behind • Up • Down • Horizontally • Vertically • Right • Left
How do we know something has moved? • By looking at the things that are not moving around it. • FRAME OF REFERENCE
Speed • What is speed? • How fast an object is moving. • Measure of distance.
Speed • How do I calculate speed? DISTANCE / TIME Ex:10ft/ 3 seconds=3.1 ft/sec
Force WHAT IS FORCE? Any push or pull that causes an object to move, stop or change speed or direction.
Force • The greater the force, the greater the change in motion. • The bigger an object is, the less effect a force will have on it. • The smaller an object is, the more effect a force will have on it.
Friction • WHAT IS FRICTION? • The force that works against motion. • Friction causes heat.
Work • WHAT IS WORK? • Work is done when a force is used to MOVE an object a certain distance.
Newton’s Laws • Inertia • Fnet=MA • F=-F <>
Newton’s First Law: Inertia
Large masses resist net forces and do not accelerate much. A large mass resists changing its velocity.
Newton’s 2nd Law: Fnet=MA
Newton’s 3rd Law: Action Reaction