A-LevelPhysicsForces, density and pressureOct/Nov 2009Paper 1 Q111 Mark
The diagrams show two ways of hanging the same picture. [Figure 11.1] In both cases, a string is attached to the same points on the picture and looped symmetrically over a nail in a wall. The forces shown are those that act on the nail. In diagram 1, the string loop is shorter than in diagram 2. Which information about the magnitude of the forces is correct?
AR₁ = R₂; T₁ = T₂
BR₁ = R₂; T₁ > T₂
CR₁ > R₂; T₁ < T₂
DR₁ < R₂; T₁ = T₂
✓ Correct Answer
The correct answer is B: R₁ = R₂; T₁ > T₂
📋 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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