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Key ideas in physics
This topic consolidates cross-cutting physics ideas from models, cause and effect, fields, differences as drivers of change, proportionality and mathematical laws.
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AQAGCSEPhysicsKey ideas
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Key terms
Energy transfer (cross-unit)Field (cross-unit)Model (cross-unit)ProportionalityGradientPotential differenceWave speedResultant forceConservationEvidence
Exam tips
- Link two units deliberately: Name the shared idea, then state how the context changes between the two units.
- Use a formula story: For every calculation, write formula, substitution, arithmetic, unit and a sentence interpreting the result.
Common mistakes
- Energy is used up: Say energy is transferred, stored or dissipated; conservation still applies.
- Current and potential difference are the same: Current is rate of flow of charge; potential difference is energy transferred per charge.
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