O-LevelPhysicsForces5054/12 · May/June 2020 · Q121 Mark
A student makes a model toy which balances on the end of a metal rod. Why are the weights needed?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
AThey increase the pressure on the rod.
BThey increase the weight of the model.
CThey lower the centre of mass below the top of the rod.
DThey raise the centre of mass above the top of the rod.
✓ Correct answer
C: They lower the centre of mass below the top of the rod.
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