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Cambridge AS & A Level Physics

1Physical quantities and units

Physical quantities and units in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
Topic68 practice questions3 lessons
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Lessons

  • SI base units, prefixes and homogeneous equations

    35 min

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  • Errors, precision, accuracy and combining uncertainties

    40 min

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  • Scalars and vectors: adding and resolving

    40 min

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Sample question

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Physical quantities and units: sample question

1 mark

Four students each measure the acceleration of free fall four times. The accepted value is 9.81 m s−29.81\ \text{m s}^{-2}. Whose readings, in m s−2\text{m s}^{-2}, are precise but not accurate?

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