A rod is pivoted at one end. Initially the angle θ of the rod to the horizontal is 0°. The weight of the rod causes a moment M about the pivot. The rod is then rotated in the vertical plane so that the angle θ of the rod increases from 0° to 180°. Which graph shows the variation of M with θ?
✓ Correct Answer
The correct answer is D: [Graph D showing M decreasing from a max to 0 at 90°, then increasing back up as a curve]
📋 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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