A-LevelPhysicsForces, density and pressure9702/12 · Oct/Nov 2010 · 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?

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A8 N m

B42 N m

C50 N m

D1250 N m

✓ Correct answer

C: 50 N m

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2010 Paper 1 Variant 2, question 12.

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