Physics book

Name the 8 energy stores

Kinetic, gravitational potential, elastic potential, thermal, chemical, nuclear, magnetic, electrostatic

Name the 4 ways in which energy can be transferred

Heating, waves, electric current, mechanically

What is a closed system?

A system where no energy can be transferred to or from the surroundings

What is work done?

Energy transferred when a force moves an object

Describe the energy transfer when a moving car slows down

Energy is transferred mechanically from the kinetic stores of the car to the thermal store of its brakes. Some energy is dissipated to the thermal energy store of the surroundingsq

Describe the energy transfer when an electric kettle is used to heat water

The electric current in a kettle transfers energy to the heating element’s thermal store - energy is then transferred by heating from the hating element’s thermal store to the thermal store of the water

Describe the energy transfer when a ball is fired using an elastic band

Energy is transferred mechanically from the elastic store of the elastic band to the kinetic store of the band - some energy is dissipated to the thermal store of the surroundings

Describe the energy transfer when a battery powered toy car is used

Energy is transferred electrically from the chemical store of the battery to the kinetic store of the toy car - some energy is dissipated to the thermal store of the surroundings

Describe the energy transfer when a falling apple hits the ground

Energy is transferred from the kinetic store of the apple and dissipated to the thermal store of the surroundings by sound waves