A-LevelPhysicsForces, density and pressureOct/Nov 2018Paper 1 Q121 Mark
A uniform rectangular board is supported by a frictionless pivot at its centre point P. [Figure 12.1] Two forces act in the plane of the board. Force F acts at corner Q and force 2.5F acts at corner R. The perpendicular distance between the line of action of force F and point P is 20 cm. The board is in equilibrium. What is the area of the board?
A160 cm²
B320 cm²
C640 cm²
D1600 cm²
✓ Correct Answer
The correct answer is C: 640 cm²
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
🔒
Unlock the Examiner's Analysis
Sign up for free to reveal the full examiner report, trap analysis, and mark scheme breakdown for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep