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: 8th graders at Butler Middle School • Kinetic, In use, involves motion – – – – Radiant: Electromagnetic, light, x-rays Thermal: Heat Motion Sound Parked Level Car, Newton’s 1st and 3rd Laws 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. Accelerating Car, All 3 of Newton’s 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 Parked Car on a Hill Brake Weight is equivalent to parallel and perpendicular forces 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 Height All KE max speed Slowing Stop D 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?