A small glider moves along a friction-free horizontal air track as shown below. At each end of the air track there is a perfectly elastic buffer. Which graph represents the variation with time t of the velocity v of the glider as it moves between the two buffers?
✓ Correct Answer
The correct answer is D: v-t graph showing square wave oscillations, constant positive velocity then instant flip to constant negative velocity of same magnitude.
📋 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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