A-LevelPhysicsForces, density and pressureMay/June 2020Paper 1 Q121 Mark
A thin horizontal beam XY is freely hinged at point Y to a vertical wall. The beam is held stationary by a cable XZ which is attached to the wall at point Z. [Figure 12.1] The beam supports a weight W at point X. The forces in the cable and the beam are F_C and F_B respectively. Which vector triangle represents the forces acting on point X? [Figure 12.2]
ADiagram showing three vectors forming a closed triangle: W vertically down, F_C upwards and left, F_B horizontally right, arranged head-to-tail.
BDiagram showing three vectors forming a closed triangle: W vertically down, F_B horizontally right, F_C upwards and left, arranged head-to-tail.
CDiagram showing three vectors forming a closed triangle: F_C upwards and left, F_B horizontally right, W vertically down, arranged head-to-tail.
DDiagram showing three vectors forming a closed triangle: W vertically down, F_C upwards and right, F_B horizontally left, arranged head-to-tail.
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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...
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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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