A-LevelPhysicsForces, density and pressureOct/Nov 2010Paper 1 Q121 Mark
A spanner is used to tighten a nut as shown. [Figure showing a spanner applying a force F = 200 N at a distance of 0.25 m from the nut. The nut has a radius of 0.04 m, but the force is applied at the end of the spanner.] A force F is applied at right-angles to the spanner at a distance of 0.25 m from the centre of the nut. When the nut is fully tightened, the applied force is 200 N. What is the resistive torque, in an anticlockwise direction, preventing further tightening?
A8 N m
B42 N m
C50 N m
D1250 N m
✓ Correct Answer
The correct answer is C: 50 N m
📋 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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