Question detail
Which option best applies extension for Stretching and deformation in AQA GCSE Physics Forces?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Forces and elasticity
Question
- A. The increase in length of an object when stretched — application focus for extension
- B. This confuses elastic and plastic deformation and does not answer Stretching and deformation.
- C. This is too vague because it does not use the force or motion quantity named in the objective.
- D. This reverses the physical cause and effect for Forces and elasticity.
Answer
The correct answer is: The increase in length of an object when stretched — application focus for extension
Explanation
The correct option is The increase in length of an object when stretched — application focus for extension. The increase in length of an object when stretched — application focus for extension is correct because it matches the approved learning objective to distinguish extension from total length in practical measurements. This answer belongs to Stretching and deformation within Forces and elasticity, so it must use precise AQA GCSE Physics forces and motion vocabulary. The other options are wrong because they either confuse elastic and plastic deformation, omit the required force or motion condition, or move away from the exact subtopic being tested.
Common mistake
Confusing total length with extension
Students often treat the measured length of a stretched spring as the extension, rather than subtracting the original length to find the change in length.
Remind students that extension (ΔL) is the difference between the stretched length and the original length: ΔL = L_stretched – L_original. Always record both lengths and calculate the extension separately before using it in Hooke’s law or energy equations.
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