A-LevelPhysicsForces, density and pressureMay/June 2017Paper 1 Q121 Mark
A uniform beam is pivoted at P as shown. Weights of 10 N and 20 N are attached to its ends. The length of the beam is marked at 0.1 m intervals. The weight of the beam is 100 N. At which point should a further weight of 20 N be attached to achieve equilibrium? [Figure shows a beam pivoted at P. A 10N weight is at the left end (0.1m from P), and a 20N weight is at the right end (0.4m from P). Points A, B, C, D are marked along the beam.]
AA
BB
CC
DD
✓ Correct Answer
The correct answer is D: D
📋 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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