May/June 2026 Paper 22

2026 · 40 questions · 40 parts · 40 marks

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5Moments Equilibrium Centre MassHard1 mark
A student is designing a toy. She attaches a model plane to one end of a uniform metal rod. The weight of the metal rod is 0.50 N. The weight of the model plane is 3.5 N. She uses a counterbalance to keep the system in equilibrium.
a uniform metal rod pivoted 20 cm from its left end (where the counterbalance hangs) and 15 cm from its right end (where the 3.5 N model plane hangs); the rod's own 0.50 N weight acts at its centre, 5.0 cm to the right of the pivot
What is the weight of the counterbalance?