A-LevelPhysicsWork, energy and powerMay/June 2015Paper 1 Q151 Mark
A uniform solid block has weight 500 N, width 0.4 m and height 0.6 m. The block rests on the edge of a step of depth 0.8 m, as shown. [Figure showing a block resting on a step. Part of the block is on the step, part overhangs. Dimensions: block width 0.4m, height 0.6m. Step depth 0.8m. Overhanging part implies the block is initially horizontal with 0.4m width on the step.] The block is knocked over the edge of the step and rotates through 90° before coming to rest with the 0.6 m edge horizontal. What is the change in gravitational potential energy of the block?
A300 J
B400 J
C450 J
D550 J
✓ Correct Answer
The correct answer is C: 450 J
📋 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.
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