A-LevelPhysicsForces, density and pressureMay/June 2013Paper 1 Q121 Mark
A vehicle is at rest on a slope. It is considered to have three forces acting on it to keep it in equilibrium. They are its weight W, a normal reaction force R and a frictional force F. Which triangle of forces is correct?
ADiagram showing W downwards, F upwards-right, R upwards-left, forming a closed triangle.
BDiagram showing W downwards, F upwards-right, R downwards-right, forming a closed triangle.
CDiagram showing W downwards, R upwards-left, F downwards-right, forming a closed triangle.
DDiagram showing W downwards, F downwards-right, R upwards-left, forming a closed triangle.
✓ Correct Answer
The correct answer is A. This question tests the candidate's understanding of forces, density and pressure within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
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