A-LevelPhysicsForces, density and pressure9702/12 · Feb/Mar 2017 · Q31 Mark

A pendulum bob is held stationary by a horizontal force H. The three forces acting on the bob are shown in the diagram. The tension in the string of the pendulum is T. The weight of the pendulum bob is W. The string is held at an angle of 30° to the vertical. Which statement is correct?

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.

AH = T cos 30

BT = H sin 30

CW = T sin 30

DW = T cos 30

✓ Correct answer

D: W = T cos 30

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2017 Paper 1 Variant 2, question 3.

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