A-LevelPhysicsDynamicsOct/Nov 2019Paper 1 Q71 Mark
A snooker ball has a mass of 200 g. It hits the cushion of a snooker table and rebounds along its original path. The ball arrives at the cushion with a speed of 14.0 m s⁻¹ and then leaves it with a speed of 7.0 m s⁻¹. The ball and the cushion are in contact for a time of 0.60 s. What is the average force exerted on the ball by the cushion?
A1.4 N
B2.3 N
C4.2 N
D7.0 N
✓ Correct Answer
The correct answer is D: 7.0 N
📋 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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