Energy is what makes things happen, and it can be stored and transferred in many forms. This unit covers energy stores, the conservation of energy and how to measure efficiency.
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Energy stores
Energy can be stored as kinetic energy in moving objects.
Gravitational potential energy is stored in objects raised above the ground.
Other stores include chemical, elastic, thermal and nuclear energy.
Energy is measured in joules (J).
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1. The principle of conservation of energy states that energy can be what?
2. As a ball falls towards the ground, which energy change mainly happens?
3. A device takes in 200 J and usefully transfers 50 J. What is its efficiency?
4. What is the unit of power?
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