AQA · Physics · 8463
GCSE Physics: Gravity
Forces · AQA GCSE Physics (8463), specification point 4.5.1.3. Cards are generated from the exam board's own specification for "Gravity", and every card links back to the page it came from. Specification © AQA — used with attribution.
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Define weight.
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The force acting on an object due to gravity.
What causes the force of gravity close to the Earth?
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The gravitational field around the Earth.
What does the weight of an object depend on?
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The gravitational field strength at the point where the object is (and its mass).
What is the equation for weight?
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W = m g (weight = mass × gravitational field strength).
What is the SI unit of weight?
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The newton (N).
What is the unit of gravitational field strength, g?
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Newtons per kilogram (N/kg).
The weight of an object may be considered to act at a single point called the object's ?.
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centre of mass
What is the relationship between the weight and the mass of an object?
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They are directly proportional (W ∝ m).
Which instrument is used to measure weight?
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A calibrated spring-balance (newtonmeter).
Which symbol means 'is directly proportional to'?
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∝
A 5 kg object is in a field where g = 9.8 N/kg. What is its weight?
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W = mg = 5 × 9.8 = 49 N.
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