Y9 Exam Revision

Front

Name the five energy stores

Back

kinetic, gravitational potential, elastic potential, thermal, chemical

Front

Name the four ways in which energy can be transferred.

Back

heating, waves, electric current, mechanically (by forces)

Front

What is a system?

Back

an object or group of objects

Front

What is a closed system?

Back

a system where no energy can be transferred to or from the surroundings – the total energy in the system stays the same

Front

What is work done?

Back

energy transferred when a force moves an object

Front

What is the unit for energy?

Back

joules (J)

Front

What is one joule of work?

Back

the work done when a force of 1 N causes an object to move 1 m in the direction of the force

Front

Describe the energy transfer when a moving car slows down.

Back

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

Front

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

Back

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

Front

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

Back

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