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CAIE A-Level Physics AS 4.1.4 The Torque of a Couple Questions

Apply the principle of moments to bodies in equilibrium, with clockwise and anticlockwise moments balanced.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • Apply the principle of moments to bodies in equilibrium, with clockwise and anticlockwise moments balanced.

CAIE A-Level Physics AS 4.1.4 The Torque of a Couple Questions question 1

[Maximum number: 1]

A thin disc of radius r is supported at its centre O by a pin. The disc is supported so that it is vertical. Three forces act in the plane of the disc, as shown in Fig.2.1.

Fig. 2.1

Fig. 2.1

Two horizontal and opposite forces, each of magnitude 1.2 N , act at points A and B on the edge of the disc. A force of 6.0 N , at an angle θ\theta below the horizontal, acts on the midpoint C of a radial line of the disc, as shown in Fig. 2.1. The disc has negligible weight and is in equilibrium.

State an expression, in terms of r, for the torque of the couple due to the forces at A and B acting on the disc.

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