# Chapter 7. Work, energy and power

Mind Map by Scott Heiron, updated more than 1 year ago
 Created by Scott Heiron about 7 years ago
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### Description

Chapter 7. Work, energy and power in physics G481

## Resource summary

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

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