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Cambridge AS & A Level Physics

P3.2Uncertainties, conclusions and evaluation

Uncertainties, conclusions and evaluation in Cambridge AS & A Level Physics: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. P3.2.1Estimate absolute and percentage uncertainties, including half the range of repeated readings.
  2. P3.2.2Draw conclusions, find constants and test a relationship by comparing percentage difference with a stated uncertainty.
  3. P3.2.3Identify the main limitations and sources of uncertainty of a procedure.
  4. P3.2.4Suggest realistic improvements to the method or apparatus.

Lessons

  • Uncertainty in readings, limitations and improvements

    40 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Uncertainties, conclusions and evaluation: sample question

1 mark

A student times a paper cone falling from a fixed height three times: 1.82 s1.82\ \text{s}, 1.94 s1.94\ \text{s} and 1.86 s1.86\ \text{s}. The stop-watch reads to 0.01 s0.01\ \text{s}. What is the best estimate of the absolute uncertainty in the time?

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