Students identify kinetic, gravitational and elastic potential, chemical, electrical, thermal, light and sound energy, then trace the energy transformations in everyday devices and activities. The law of conservation of energy is applied to simple calculations of useful and wasted energy and efficiency, and to explaining why a bouncing ball never returns to its starting height.
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Curriculum: Australian Curriculum. We show specific outcome codes only where they have been verified against the official curriculum document.
Completed: Forms of Energy and Energy Transformations
Year 8 students (typically ages 13–14) working on energy, light, sound & electricity. It is pitched at level 2 · standard.
Yes. The PDF includes a full answer sheet with model answers and success criteria where there is more than one good answer. You can also view the answers online.
About 35 minutes for 20 questions. Short, regular sessions work best: two or three a week beats one long one.
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Try Heat Transfer: Conduction, Convection and Radiation.
Success TutoringWorksheetsYear 8 · Science · Energy, Light, Sound & ElectricityName
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Energy is never used up; it changes form. Always ask: where did the energy come from, and where did it go?
Energy is measured in joules (J). It comes in several forms:
Kinetic energy is the energy of a moving object. Gravitational potential energy is stored in an object because of its height above the ground. Elastic potential energy is stored in something stretched or squashed, such as a spring. Chemical energy is stored in food, fuels and batteries. Electrical energy is carried by an electric current. Thermal (heat) energy comes from the movement of particles in a substance. Light and sound energy travel outwards from their sources.
The law of conservation of energy says that energy cannot be created or destroyed. It can only be transferred from one object to another or transformed from one form into another. The total amount of energy stays the same.
Devices rarely turn all of their energy into the form we want. The rest is wasted energy, usually thermal energy and sound that spread into the surroundings. Efficiency = useful energy output ÷ total energy input × 100%.
Write the main energy transformation for each, using arrows. Example: a wood fire: chemical → thermal + light.
Show your working. Remember: total energy in = total energy out.
Preview — the PDF contains the full resource and answer sheet.
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