A-LevelPhysicsForces, density and pressureOct/Nov 2017Paper 1 Q121 Mark
The diagram shows a solid cube with weight W and sides of length L. It is supported at rest by a frictionless spindle that passes through the centres of two opposite vertical faces. One of these faces is shaded. [Figure showing a cube with spindle through its centre] The spindle is now removed and replaced at a distance L/4 to the right of its original position. [Figure showing the cube with the spindle moved L/4 to the right] When viewing the shaded face, what is the torque of the couple that will now be needed to keep the cube at rest?
AW L / 4 anticlockwise
BW L / 4 clockwise
CW L / 2 anticlockwise
DW L / 2 clockwise
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The correct answer is B. 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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