A-LevelPhysicsForces, density and pressure9702/12 · Oct/Nov 2014 · Q121 Mark

A uniform ladder rests against a vertical wall where there is negligible friction. The bottom of the ladder rests on rough ground where there is friction. The top of the ladder is at a height h above the ground and the foot of the ladder is at a distance 2a from the wall. The diagram shows the forces that act on the ladder. [Figure 12.1] Which equation is formed by taking moments?

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AWa + Fh = 2Wa

BFa + Wa = Fh

CWa + 2Wa = Fh

DWa – 2Wa = 2Fh

✓ Correct answer

A: Wa + Fh = 2Wa

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2014 Paper 1 Variant 2, question 12.

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