O-LevelPhysicsForces5054/11 · May/June 2010 · Q81 Mark
A wooden trapdoor is hinged along one side and, when closed, is supported on the other side by a ledge. When the trapdoor is closed, the ledge exerts an upward force of 15 N on the trapdoor. The gravitational field strength is 10N/kg. What is the mass of the trapdoor?
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.
A1.5 kg
B3.0 kg
C30 kg
D150 kg
✓ Correct answer
B: 3.0 kg
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