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GCSE Physics · key term
A relationship in which multiplying one quantity by a factor multiplies the other quantity by the same factor.
Used by AQA, Edexcel and OCR
Paper 2
A relationship in which multiplying one variable by a particular factor multiplies the other variable by the same factor.
Revise: Hooke's Law and Elastic Potential Energy CalculationsWithin the directly proportional region, increasing the applied force increases the extension in the same ratio. Doubling the force doubles the extension; tripling the force triples it.
Specification 2.18, 2.32P, 2.33P, 15.5 · Paper 1, Paper 2
A relationship in which one quantity changes by the same factor as another, so their ratio remains constant.
A relationship in which one quantity changes by the same factor as another quantity.
A relationship in which one variable is a constant multiple of the other, represented by a straight line through the origin.
Specification P2.2l, P2.3j · Paper 1 (Foundation), Paper 3 (Higher)
A relationship in which multiplying one quantity by a factor causes the other quantity to be multiplied by the same factor.
Use precise graph language: a directly proportional relationship is a straight line through the origin; a non-linear relationship is represented by a curve.
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