(a) State what is meant by the centre of gravity of a body.
(b) A uniform wooden post AB of weight 45N stands in equilibrium on hard ground, as shown in Fig. 2.1.
[Figure 2.1]
End A of the vertical post is supported by the ground. A horizontal wire with tension T is
attached to end B of the post. Another wire, attached to the post at point C, is at an angle of
60° to the horizontal and has tension 38 N. The distances along the post of points A, B and C
are shown in Fig. 2.1.

Q: What topic does this question test?

This question tests Forces, density and pressure in A-Level Physics (syllabus code 9702). It is worth 6 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Oct/Nov 2020 examination, Paper 2 Variant 3 (9702_w20_qp_23.pdf).

Question

(a) State what is meant by the centre of gravity of a body.
(b) A uniform wooden post AB of weight 45N stands in equilibrium on hard ground, as shown in Fig. 2.1.
[Figure 2.1]
End A of the vertical post is supported by the ground. A horizontal wire with tension T is
attached to end B of the post. Another wire, attached to the post at point C, is at an angle of
60° to the horizontal and has tension 38 N. The distances along the post of points A, B and C
are shown in Fig. 2.1.

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