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Test terminal velocity with repeated measurements Turn an investigation question into measurements Compare a result with evidence, not just an accepted number Use limitations to improve the next experiment Practical skills1.1 Planning1.1.1 Implementing1.1.2 Analysing1.1.3 Evaluating1.1.4 Motion with non-uniform acceleration3.2.2
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Use limitations to improve the next experiment

OCR A AS Physics · Two ideas, one explanation

A useful improvement addresses a specific limitation in the method. The next design should explain how the change improves the evidence.

Identified limitation → targeted change → expected benefit

Follow the reasoning

  1. Name the dominant source of uncertainty or bias.
  2. Propose a practical change aimed at that source.
  3. Explain why the resulting measurements should be more useful.
Specification outcomes (4)
  • 1.1.4(c) Limitations in experimental procedures.
  • 1.1.4(e) Refining experimental design by suggesting improvements to procedures and apparatus.
  • 1.1.1(a) Experimental design, including to solve problems set in a practical context.
  • 1.1.1(c) Evaluation that an experimental method is appropriate to meet the expected outcomes.
Open the official OCR AS specification ↗

H156 v2.0 · May 2026

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