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?