Homework:
- Ex 4E, p.115-117 Kinematics (earlier week)
- Ex 4F, p.119-124 Projectile Motion (earlier week)
- Ex 4A, p.90-94 Vectors (earlier week)
- Ex 4H, p.132-134, Circular Motion (earlier week)
- Ex 4B, p.97-104 Forces (earlier week)
- Ex 4F, p.143-147 Energy, Work, Power (this week)
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?
A Simple Proof of Conservation of Energy
Work, Energy, and Power
Work, Energy and Power Review
Gravitational Potential Energy and Kinetic Energy Skate Park PhET Link - HTML
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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