A-LevelPhysicsWork, energy and power9702/12 · Feb/Mar 2020 · 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

D: being pulled 10 m across snow

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Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2020 Paper 1 Variant 2, question 16.

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