A-LevelPhysicsForces, density and pressure9702/12 · Oct/Nov 2022 · Q131 Mark

A box of length 12cm and weight 0.43 N is placed on a horizontal table, with the greater part of its length overhanging the edge of the table. The edge of the table acts as a pivot. The centre of gravity of the box is at its geometric centre. To balance the box, a uniform sphere of diameter 2.4 cm is placed inside the box, touching one end, as shown. [Figure showing a box on a table with a sphere inside] Assume that the forces acting on the box are in the plane of the diagram. What is the minimum mass of the sphere that is needed to maintain the system in equilibrium?

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.

A0.066 kg

B0.13 kg

C0.22 kg

D1.3 kg

✓ Correct answer

B: 0.13 kg

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2022 Paper 1 Variant 2, question 13.

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