A-LevelPhysicsForces, density and pressureMay/June 2021Paper 1 Q131 Mark
A uniform square sign of weight 40 N is suspended vertically from its top edge by a horizontal hinge, as shown. [Figure 13.1] The hinge is not frictionless. When the sign is displaced from the vertical by an external force and then released, it does not return to the vertical position. The maximum torque exerted by the hinge on the sign is 6.0 N m. The sign is displaced by 90° so that it is horizontal and then gradually released. At which angle to the vertical does the sign hang after release?
A11°
B22°
C68°
D79°
✓ Correct Answer
The correct answer is B: 22°
📋 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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