A-LevelPhysicsForces, density and pressure9702/12 · May/June 2012 · Q151 Mark

The diagram shows a solid cube with weight W and sides of length L. It is supported by a frictionless spindle that passes through the centres of two opposite vertical faces. One of these faces is shaded. [Figure 15.1] The spindle is now removed and replaced at a distance L/4 to the right of its original position. When viewing the shaded face, what is the torque of the couple that will now be needed to stop the cube from toppling?

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AWL/2 anticlockwise

BWL/2 clockwise

CWL/4 anticlockwise

DWL/4 clockwise

✓ Correct answer

D: WL/4 clockwise

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2012 Paper 1 Variant 2, question 15.

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