May/June 2026 Paper 21

2026 · 40 questions · 40 parts · 40 marks

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6Moments Equilibrium Centre MassHard1 mark
The diagram shows a uniform metre ruler of weight . Two additional weights, and , act on the metre ruler. The ruler is balanced horizontally.
a metre ruler on a pivot, with weight P acting down at the left end, weight Q acting down a distance y to the right of the pivot, and weight R acting down a further distance z to the right, the whole span from P to R split into x (P to pivot) and y and z
Which equation is correct?