THE TURNING EFFECT OF FORCES
1 mark · NormalIn a uniform ruler, where does the weight act? State the name of the point.
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At the centre of gravity (centre of mass).
Also accept: centre of mass
Common mistakes: Middle of the ruler (must say centre of gravity or mass)
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Marking points
B1 · 1 mark · Correctly names centre of gravity or centre of mass as the point where the weight acts
Worked solution
The weight of a uniform ruler acts through its centre of gravity, which is the centre of mass.