A-LevelPhysicsWork, energy and powerMay/June 2022Paper 1 Q181 Mark
A student attempts to derive the formula for kinetic energy Eκ. She begins by considering an object of mass m which is initially at rest. A constant force F applied to the object causes it to accelerate to final velocity v in displacement s. The kinetic energy gained by the object is equal to the work done on the object by the force F. Which equation would the student not need in order to derive the formula for Eκ?
AF = ma
BW = Fs
CEκ = ½Fs
Dv² = u² + 2as
✓ Correct Answer
The correct answer is C: Eκ = ½Fs
📋 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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