A-LevelPhysicsForces, density and pressureOct/Nov 2019Paper 1 Q111 Mark
A rigid uniform bar of length 2.4 m is pivoted horizontally at its midpoint. [Figure showing a pivoted bar with 200 N weight at 0.8 m left and 300 N weight at 0.8 m right from the pivot] Weights are hung from two points on the bar as shown in the diagram. To maintain equilibrium, a couple is applied to the bar. What is the torque and direction of this couple?
A40 N m clockwise
B40 N m anticlockwise
C80 N m clockwise
D80 N m anticlockwise
✓ Correct Answer
The correct answer is A: 40 N m clockwise
📋 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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