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Chapter 7. Work, energy and power
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Chapter 7. Work, energy and power in physics G481
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physics g481
a levels
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Scott Heiron
, updated more than 1 year ago
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Scott Heiron
almost 10 years ago
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Resource summary
Chapter 7. Work, energy and power
Doing work, transferring energy
Factors for doing work
The size of the force F - bigger the force, greater work
The distance travelled x - Further distance, more work
Work done = force x distance moved in direction of force
W=Fx
Work in Nm (Newton metres) or J (Joules)
Work Done = Energy transferred
If F at angle theta to direction of motion then W = FxCos(theta)
Change in GPE = Weight x Change in height
Ep = mgh
Faster an object, greater kinetic energy
Kinetic energy = 0.5 x mass x speed^2
Ek = 0.5mv^2
If no energy is lost during energy transfer then Change in GPE = Change in KE
mgh = 0.5mv^2
Energy transfers and conservation
Energy efficiency = (Useful output energy / Total input energy) x 100%
Sankey diagram can represent energy transfer
Conservation of energy - The total energy at the beginning = Total energy at the end in a closed system
Power
Power is the rate at which work is done
P = W / t
Power measured in Watts (W) (Joules per second)
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