A-LevelPhysicsPhysical quantities and unitsOct/Nov 2023Paper 1 Q31 Mark
A student takes measurements to determine the constant acceleration of a model car moving from rest in a straight line. The measured values with their absolute uncertainties are shown. [Table of quantities, measured values and uncertainties] The student uses the equation s = ½at² to calculate the acceleration of the car. What is the acceleration and its absolute uncertainty?
A(0.11 ± 0.01) m s⁻²
B(0.11 ± 0.02) m s⁻²
C(0.15 ± 0.01) m s⁻²
D(0.15 ± 0.02) m s⁻²
✓ Correct Answer
The correct answer is D: (0.15 ± 0.02) m s⁻²
📋 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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