Explain why measurements should be repeated when investigating extension.

In the subtopic Stretching and deformation, this learning objective focuses on explain why measurements should be repeated when investigating extension. For AQA GCSE Physics 8463 Unit 4.5 Forces, keep the explanation inside Stretching and deformation and Forces and elasticity. Approved keywords for this objective include extension. A strong answer separates scalar and vector quantities, uses correct units where quantities are involved, and links the physical reasoning back to explain why measurements should be repeated when investigating extension. This is not a generic revision point: it is specifically about Stretching and deformation, Forces and elasticity, and the approved wording of the learning objective.