Energy Transformations. Energy Ability to do Work or cause Change.

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Presentation transcript:

Energy Transformations

Energy Ability to do Work or cause Change

Energy comes in many Forms Potential, In Storage waiting to be used –Chemical –Mechanical: Tension in a spring or rubber band –Nuclear –Gravitational –Electrical –Human: 8 th graders at Butler Middle School Kinetic, In use, involves motion –Radiant: Electromagnetic, light, x-rays –Thermal: Heat –Motion –Sound

Weight pushes down into road Road reacts by pushing up on car No Forces are parallel to the road With breaks off, car will Not move, unless something pushes, pulls or starts it. Parked Level Car, Newton’s 1 st and 3 rd Laws

2 forces are present, parallel to road Force to left is pushing car forward Force to right is air resistance and friction Chemical Energy in tank is converted to Kinetic energy of the moving car Accelerating Car, All 3 of Newton’s Laws

Parked Car on a Hill Weight is equivalent to parallel and perpendicular forces Brake With break on, Car has all Potential Energy from gravity If Break is turned off, Car will move, PE converts to Kinetic Energy

Today’s Experiment If truck is just coasting, is this animation an accurate model of the truck’s motion?

Today’s Experiment All PE All KE max speed Stop D Slowing Height What will effect distance D ? What happens to KE as truck slows down? What keeps truck moving at bottom of ramp? What if we could eliminate all friction and air resistance?