A-LevelPhysicsForces, density and pressure9702/12 · May/June 2018 · Q171 Mark

The diagram shows a ball of weight W hanging in equilibrium from a string. [Diagram] The string is at an angle θ to the vertical. The tension in the string is T. The ball is held away from the wall by a horizontal force P from a metal rod. What is the relationship between the magnitudes of T, P and W?

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AP = T cosθ and W = T sinθ

BT = P + W

CT² = P² + W²

DW = P tanθ and W = T cosθ

✓ Correct answer

C: T² = P² + W²

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2018 Paper 1 Variant 2, question 17.

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