CP3- Conservation Of Energy
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What are the 8 main energy stores?
Chemical, kinetic, gravitational potential, elastic, thermal, magnetic, electrostatic, nuclear
What are examples of chemical energy?
Fuel, food, battery
What are examples of kinetic energy?
Moving objects
What are examples of gravitational potential energy?
Raised mass
What are examples of elastic energy?
Stretched spring
What are examples of thermal energy?
Hot object
What are examples of magnetic energy?
Two magnets
What are examples of electrostatic energy?
Two charges
What are examples of nuclear energy?
Radioactive decay
In what 4 ways is energy transferred from one store to another?
Mechanically, electrically, thermal, radiation
The rate at which thermal energy is transferred through the wall of a house depends on what?
The difference in temperature between inside and outside, the thickness of the walls, the material the walls are made of
What is the equation for efficiency?
Useful energy transferred by the machine/total energy supplied to the machine
What are non-renewable energy resources?
Resources that will eventually run out, they are available all the time
What are examples of non-renewable energy resources?
Nuclear fuels, fossil fuels
What are renewable energy resources?
They do not run out, do not cause pollution or emit carbon dioxide
What are examples of renewable energy resources?
Solar cells, bio-fuels, hydroelectricity, tidal power, wind turbines
What is the equation for the change in gravitational potential energy?
Mass x change in gravitational field strength x change in vertical height
What is the equation for kinetic energy?
1/2 x mass x speed^2