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What are the energy stores?
Chemical, thermal, kinetic, gravitational potential energy, elastic potential energy, magnetic, electrostatic and nuclear.
Chemical energy store
Energy due to the bonds between particles, stored in food, batteries and fuels
Thermal energy store
Filled when an object is warmed up.
Kinetic energy store
Moving objects
Gravitational potential energy
Objects gain energy in their GPE when they are lifted through a gravitational field
Elastic energy store
Filled when a material is stretched or compressed.
Magnetic energy store
Magnets that are attracting or repelling
Electrostatic energy store
Objects with charge (like electrons and protons) interacting with one another have energy in their electrostatic store
Nuclear energy store
Atomic nuclei release energy from this store in nuclear reactions
What are the energy transfers?
Mechanically, electrically, by heating, by radiation (light and sound)
What is the law of conservation of energy?
Energy can't be created or destroyed but it may change form and the total amount stays the same.
What is energy measured in?
Joules (J)
What is the equation for efficiency?
Efficiency = (useful energy output/total energy input) x 100
What is the equation for work done?
Work done (J) = force (N) x distance moved (m)
What is work done equal to?
Energy transferred