A-LevelPhysicsWork, energy and powerFeb/Mar 2022Paper 1 Q161 Mark
An escalator is 60 m long and lifts passengers through a vertical height of 30 m, as shown. [Figure 16.1] To drive the escalator against the forces of friction when there are no passengers requires a power of 2.0 kW. The escalator is used by passengers of average mass 60 kg and the power to overcome friction remains constant. How much power is required to drive the escalator when it is carrying 20 passengers and is travelling at 0.75 ms⁻¹?
A4.4 kW
B6.4 kW
C8.8 kW
D10.8 kW
✓ Correct Answer
The correct answer is B: 6.4 kW
📋 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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