KS3 Science · Physics
Energy
Nine short lessons. Look at the picture, learn three things, then play.
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Key words
Joule The unit of energy
Kinetic store Filled when an object speeds up
Gravitational potential store Filled when an object is raised
Elastic store Filled when a material is stretched or squashed
Chemical store The energy store in food, fuels and batteries
Thermal store Filled when an object is warmed up
Conservation of energy Energy cannot be created or destroyed
Dissipated Spread out wastefully into the surroundings
Power How quickly energy is transferred, in watts
Kilowatt hour The energy a 1 kW appliance transfers in one hour
Fossil fuel Coal, crude oil or natural gas
Renewable A resource that is replaced, so it will not run out
Temperature How hot something is, in degrees Celsius
Thermal equilibrium When two objects are at the same temperature
Conduction Vibrating particles pass energy to their neighbours
Convection A heated liquid or gas rises and carries energy with it
Radiation Energy transferred by waves, even across empty space
Thermal insulator A material that lets energy through only slowly