# Energy Transfer

- Created by: highamR15
- Created on: 26-01-19 09:56

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- Energy transfer (1)
- 9 forms of Energy
- Thermal
- Chemical
- Kinnetic
- Light
- Gravitational Protential
- Elastic
- Electrical
- Nuclear
- Sound

- The law of conservation of energy
- Energy can not be created or destroyed but only transferred or transformed.
- Transformed: changes energy type
- Transferred: same energy different place

- Energy can not be created or destroyed but only transferred or transformed.
- Sankey diagram
- The width of the arrow indicates the amount if energy there is.

- Efficiency
- Efficiency is a measure of how good a machine is at its job or how wasteful the machine is.
- It is calculated by doing (useful energy out / total energy in) X 100.
- Never write fractions normal write a decimal fraction.

- Kinetic energy
- Kinetic energy= 1/2 X mass X velocity squared or Ek=1/2mv squared
- Ek=J
- m=Kg
- V squared =m/s

- Kinetic energy= 1/2 X mass X velocity squared or Ek=1/2mv squared
- Calculate the speed of a falling object
- Also called the speed it hits the group
- If we know the mass we can work out the speed (also need the height)
- Mass=balance
- Height= meter rule

- Work
- Work is done whenever energy is converted from one form to another.
- If an object gains 100J of g.p.e. Then 100J of work has been done.
- Work done=force X distance moved in the direction of the force

- Power
- Power is the rate at which work is done.
- Power = work done /time

- 9 forms of Energy

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