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Question 5

An aerospace engineer is testing a newly developed bio-synthetic polymer fibre to determine its Young modulus, EEE. The fibre is suspended vertically and subjected to a tensile load. The engineer records the following measurements along with their respective percentage uncertainties:

  • Tensile load (force, FFF): 2.0%
  • Original length of the fibre (LLL): 1.5%
  • Radius of the fibre (rrr): 2.5%
  • Extension under load (eee): 6.0%

Determine which of the four measurements contributes the greatest percentage uncertainty to the calculated value of the Young modulus. Support your answer by calculating the percentage uncertainty contribution of each of the four measurements to the calculated value of EEE.

[4]
Markscheme

Materials Questions

  1. A Level
  2. /Physics
  3. /Materials

20 exam-style questions on AQA A Level Physics Materials, covering Bulk properties of solids and The Young modulus. Each one has a worked solution and a mark scheme showing where the marks go.

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