A-LevelPhysicsDynamicsOct/Nov 2015Paper 1 Q111 Mark
A single horizontal force F is applied to a block X which is in contact with a separate block Y as shown. [Figure showing force F applied to block X, which is in contact with block Y] The blocks remain in contact as they accelerate along a horizontal frictionless surface. Air resistance is negligible. X has a greater mass than Y. Which statement is correct?
AThe acceleration of X is equal to force F divided by the mass of X.
BThe force that X exerts on Y is equal to F.
CThe force that X exerts on Y is less than F.
DThe force that X exerts on Y is less than the force that Y exerts on X.
✓ Correct Answer
The correct answer is C: The force that X exerts on Y is less than F.
📋 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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