AQA · Physics · 8463
GCSE Physics: Changes in energy
Energy · AQA GCSE Physics (8463), specification point 4.1.1.2. Cards are generated from the exam board's own specification for "Changes in energy", and every card links back to the page it came from. Specification © AQA — used with attribution.
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What is the equation for the kinetic energy of a moving object?
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Ek = ½ m v² (kinetic energy = 0.5 × mass × speed²).
The kinetic energy of an object is proportional to the square of its ?.
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speed
What is the SI unit of kinetic energy?
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The joule (J).
What unit must speed be in when using Ek = ½ m v²?
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Metres per second (m/s), with mass in kg to give energy in joules.
What is the equation for elastic potential energy stored in a stretched spring?
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Ee = ½ k e² (elastic potential energy = 0.5 × spring constant × extension²).
What condition must hold for Ee = ½ k e² to be valid?
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The limit of proportionality must not have been exceeded (the spring still obeys Hooke's law).
What is the unit of the spring constant, k?
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Newtons per metre (N/m).
What is the equation for gravitational potential energy gained by a raised object?
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Ep = m g h (g.p.e. = mass × gravitational field strength × height).
What is the unit of gravitational field strength, g?
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Newtons per kilogram (N/kg).
Which GCSE energy equation is given on the Physics equation sheet rather than recalled: kinetic, elastic potential, or gravitational potential?
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Elastic potential energy (Ee = ½ k e²). Ek = ½ m v² and Ep = m g h must be recalled.
Will the value of gravitational field strength (g) be given in a GCSE Physics calculation?
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Yes — in any calculation the value of g will be given.
In Ee = ½ k e², what quantity is e and what is its unit?
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The extension of the spring, in metres (m).
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