A-LevelPhysicsForces, density and pressure9702/12 · May/June 2013 · 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?

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.

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

A: Diagram showing W downwards, F upwards-right, R upwards-left, forming a closed triangle.

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Topic: Forces, density and pressure, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2013 Paper 1 Variant 2, question 12.

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