A-LevelPhysicsDynamicsOct/Nov 2015Paper 1 Q121 Mark
A mass of 0.20 kg is suspended from the lower end of a light spring. A second mass of 0.10 kg is suspended from the first mass by a thread. The arrangement is allowed to come into static equilibrium and then the thread is burned through. [Figure showing a spring with 0.20kg mass, and 0.10kg mass suspended below by a thread] At this instant, what is the upward acceleration of the 0.20 kg mass? (Assume g = 10 ms⁻².)
A5.0 ms⁻²
B6.7 ms⁻²
C10 ms⁻²
D15 ms⁻²
✓ Correct Answer
The correct answer is A: 5.0 ms⁻²
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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