Energy stores & transfers
AQA GCSE Physics revision on Energy stores & transfers. Aligned to the AQA GCSE Physics 8463 specification. This bank has 34 practice questions on this topic.
Sample questions (3 of 34)
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Question 1
Which is NOT an energy store?
- A) Kinetic
- B) Chemical
- C) Sound
- D) Gravitational potential
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Answer: Sound
Energy STORES (where energy is kept): kinetic (moving things), gravitational potential (high things), chemical (food, fuel, batteries), thermal (hot things), elastic (stretched/squashed things), magnetic, electrostatic, nuclear. Energy TRANSFERS (how energy moves): heating, electrical work, mechanical work, radiation (light, sound). Sound is a transfer mechanism, not a store.
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Question 2
Kinetic energy is calculated using KE = 0.5 x m x v^2. A 2 kg ball moving at 3 m/s has KE = ?
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Answer: 9
Kinetic energy: 0.5 x mass x velocity^2. Note v is SQUARED - doubling speed quadruples kinetic energy. That's why crashes at higher speed cause much more damage. 0.5 x 2 x 9 = 9 J. Units: J (joules). Cars: a 1000kg car at 10 m/s has 50,000 J = 50 kJ of KE.
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Question 3
Gravitational potential energy = mass x g x height. A 5 kg ball lifted 2 m has GPE of (g = 10)...
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Answer: 100
GPE: stored when something is raised against gravity. Formula: m x g x h (where g = 9.8 m/s^2, often 10). 5 x 10 x 2 = 100 J. When the ball falls, that GPE converts to kinetic energy. At ground level: GPE = 0, KE = 100J (ignoring air resistance). At halfway: GPE = 50J, KE = 50J. Energy is CONSERVED, just transferred.
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