Homework:
- Springs Ex 4I, p.137-141
Energy
Energy can never be created
Energy can never be destroyed
Energy can only change its form (Work is done)
Energy has the ability to make something happen, i.e. to do Work
The unit for energy is the Joule (J)
J = Kgm2s-2 in fundamental units
Perpetual Motion Machine?
Intro to Springs and Hooke's Law
Potential Energy Stored in a Spring
PhET Simulation on Springs Link
Kinetic Energy & Gravitational Potential Energy
Gravitational Potential Energy and Kinetic Energy Skate Park PhET Link
Work
Work is a transformation (change) of energy from one form to another form. Work only occurs when something is done.
- Power is the rate at which energy is transformed
- Power is the rate at which work is done
- Unit of power Watt (W = J/s)
Power vs Energy
Work, Energy & Power
Kinetic Energy & Gravitational Potential Energy
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