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Forces explain changes in motion Changing drag produces changing acceleration Terminal motion still transfers energy Test terminal velocity with repeated measurements Turn an investigation question into measurements Use limitations to improve the next experiment Motion3.1 Forces in action3.2 Planning1.1.1 Implementing1.1.2 Evaluating1.1.4 Dynamics3.2.1 Motion with non-uniform acceleration3.2.2 Power3.3.3
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Test terminal velocity with repeated measurements

OCR A AS Physics · Two ideas, one explanation

A falling-object experiment must establish that speed is constant before treating a measured speed as terminal. Equal-distance timing intervals provide a useful check.

Equal distances in equal times → constant speed

Follow the reasoning

  1. Allow enough distance for the object to approach terminal speed.
  2. Compare speeds over successive measured sections.
  3. Control factors such as object shape and fluid temperature.
Specification outcomes (5)
  • 3.2.2(d)(i) Define and describe terminal velocity.
  • 3.2.2(d)(ii) Use techniques and procedures to determine terminal velocity in fluids, such as a ball bearing in a viscous liquid or cones in air.
  • 1.1.1(a) Experimental design, including to solve problems set in a practical context.
  • 1.1.1(b) Identification of variables that must be controlled, where appropriate.
  • 1.1.1(c) Evaluation that an experimental method is appropriate to meet the expected outcomes.
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H156 v2.0 · May 2026

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