February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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14Moments Equilibrium Centre MassHard1 mark
The diagrams show two ways of hanging the same picture.
two diagrams of the same picture hung by a string looped symmetrically over one nail: diagram 1 has a shorter string loop, with the nail's reaction force R1 vertical and the two equal string tensions T1 meeting it at a wide angle either side of vertical; diagram 2 has a longer string loop, with reaction force R2 vertical and the two equal tensions T2 meeting it at a narrower angle either side of vertical
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. The weight of the string is negligible. In diagram 1, the string loop is shorter than in diagram 2. Which information about the magnitude of the forces is correct?