THE TURNING EFFECT OF FORCES
2 marks · EasyDescribe how you would find the centre of gravity of a rectangular sheet of card.
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Draw the axes of symmetry; the centre of gravity is where they cross.
Also accept: Balance the card on a pin and mark the vertical; repeat from another side—the centre of gravity is where the two lines cross.
Common mistakes: Just saying 'balance it' with no explanation
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Marking points
B1 · 1 mark · States to draw axes of symmetry or balance method.
B1 · 1 mark · Identifies centre of gravity at intersection/crossing point.
Worked solution
To find the centre of gravity of a rectangular sheet of card, draw lines along its axes of symmetry. The centre of gravity is where these lines cross.