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GCSE Physics · key term
An approximate value based on reasonable assumptions rather than an exact measurement.
Used by Edexcel and OCR
Specification 2.32P · Paper 1
A value close enough for the intended purpose, usually found using suitable assumptions and rounded data.
Revise: Braking Distance EstimatesSuppose a simplified reference estimate at 20 mph is 6 m of thinking distance and 6 m of braking distance, giving a 12 m stopping distance.
Specification P8.1b, P8.1f, P8.1i · Paper 2 (Foundation), Paper 4 (Higher)
A reasoned approximate value based on suitable knowledge and assumptions.
Revise: Estimating accelerationsAn estimate is a sensible approximation, not a guess without reasoning.
A value found approximately from data, a graph or reasonable assumptions rather than measured or calculated exactly.
Paper 1, Paper 2
An approximate value obtained from suitable known or judged quantities rather than an exact measurement.
Treat tabulated stopping distances as estimates. For a speed between two entries, give a sensible value between the corresponding distances and show how you estimated it.
State sensible estimates for quantities not supplied, such as the initial speed or passenger mass. Show how you use them.
Avoid excessive precision: a result based on approximate inputs is also an estimate.
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