A-LevelPhysicsWork, energy and powerOct/Nov 2025Paper 1 Q171 Mark
A student attempts to derive the formula for kinetic energy E_K. She begins by considering an object of mass m that 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 does the student not need in order to derive the formula for E_K?
AF = ma
BW = Fs
CE = Fs/2
Dv² = u² + 2as
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of work, energy and power within the Physicssyllabus. The examiner's mark scheme requires...
📋 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...
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