O-LevelPhysicsForcesOct/Nov 2025Paper 1 Q131 Mark
A long plank is pivoted at its centre of gravity. Two objects, X and Y, are then placed on the plank. X has a weight of 140 N and is 1.2 m to the left of the pivot. Y has a weight of 220 N and is 0.55 m to the right of the pivot. A third object of weight 110 N is placed on the plank so that the plank is in equilibrium. On which part of the plank is the object placed? [Figure 13.1]
A[Section A]
B[Section B]
C[Section C]
D[Section D]
✓ Correct Answer
The correct answer is C: [Section C]
📋 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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