A-LevelPhysicsWork, energy and powerMay/June 2010Paper 1 Q151 Mark
A constant force F, acting on a car of mass m, moves the car up the slope through a distance s at constant velocity v. The angle of the slope to the horizontal is α. [Figure 15.1] Which expression gives the efficiency of the process?
Amgs sinα / Fv
Bmv / Fs
Cmv² / 2Fs
Dmgs sinα / F
✓ Correct Answer
The correct answer is D: mgs sinα / F
📋 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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