A-LevelPhysicsForces, density and pressureOct/Nov 2014Paper 1 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?
AWa + Fh = 2Wa
BFa + Wa = Fh
CWa + 2Wa = Fh
DWa – 2Wa = 2Fh
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The correct answer is A. This question tests the candidate's understanding of forces, density and pressure within the Physicssyllabus. The examiner's mark scheme requires...
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