A-LevelPhysicsWork, energy and powerFeb/Mar 2020Paper 1 Q161 Mark
A sledge of mass 50 kg sits on a snowy surface. It is pulled horizontally for 10 m against a frictional force of 200 N, then it is pulled horizontally across ice for 10 m. There is no friction between the ice and the sledge. It is lifted up vertically by 1 m and finally carried back at a constant speed to where it started. During which stage of its journey is most work done on the sledge?
Abeing carried back 20 m at constant speed
Bbeing lifted up 1 m
Cbeing pulled 10 m across ice
Dbeing pulled 10 m across snow
✓ Correct Answer
The correct answer is D: being pulled 10 m across snow
📋 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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