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Physics revision checklist - energy Section 4 (Power (Power = Work Done ÷…
Physics revision checklist - energy Section 4
Work Done
Work done = Energy Transfered
Work Done = force x distance
Work is measured in Joules
Force is measured in Newtons
Distance is measured in Metres
GPE
GPE = Mass x Gravity (10) x Height
GPE is measured in Joules
Mass is measured in kilograms
Gravitational field strength is measured in Newtons per kilograms
Height is measured in metres
KE- Kinetic Energy
1/2 x mass x (speed)2
1/2 x M x V2
Kinetic energy is measured in in Joules
Mass is measured in Kilograms
Speed is measured in Metres per second
Conservation of energy
Power
Power = Work Done ÷ Time taken
Power = Energy chance ÷ time
Power is measured in Watts
Work done is measured in Joules
Time taken is measured in seconds
One watt is the same as one joule per second
Measuring a persons power
w x h
w x n x s
(w x n x s) /t
Energy resources
Wind Power
AD: Renewable, environmentally friendly,
DIS: Very dependent on wind, can kill birds, not very efficient
