A-LevelPhysicsForces, density and pressure9702/12 · Feb/Mar 2024 · Q131 Mark
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?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A[Graph A showing M constant from 0 to 180°]
B[Graph B showing M decreasing then increasing, reaching 0 at 90°]
C[Graph C showing M decreasing linearly from a max to 0 at 90°, then staying 0]
D[Graph D showing M decreasing from a max to 0 at 90°, then increasing back up as a curve]
✓ Correct answer
D: [Graph D showing M decreasing from a max to 0 at 90°, then increasing back up as a curve]
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