A uniform square sheet of card ABCD is freely pivoted by a pin at a point P. The card is held in a vertical plane by an external force in the position shown in Fig. 1.1. [Figure 1.1] The card has weight 0.15N which may be considered to act at the centre of gravity G. Each side of the card has length 17cm. Point P lies on the horizontal line AC and is 4.0cm from corner A. Line BD is vertical. The card is released by removing the external force. The card then swings in a vertical plane until it comes to rest.

Q: What topic does this question test?

This question tests Forces, density and pressure in A-Level Physics (syllabus code 9702). It is worth 5 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics Oct/Nov 2019 examination, Paper 2 Variant 3 (9702_w19_qp_23.pdf).

Question

A uniform square sheet of card ABCD is freely pivoted by a pin at a point P. The card is held in a vertical plane by an external force in the position shown in Fig. 1.1. [Figure 1.1] The card has weight 0.15N which may be considered to act at the centre of gravity G. Each side of the card has length 17cm. Point P lies on the horizontal line AC and is 4.0cm from corner A. Line BD is vertical. The card is released by removing the external force. The card then swings in a vertical plane until it comes to rest.

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