A-LevelPhysicsForces, density and pressureOct/Nov 2019Paper 2 Q15 Marks
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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