A-LevelPhysicsDynamicsFeb/Mar 2021Paper 1 Q81 Mark

A ball strikes a horizontal surface with momentum p at an angle θ to the surface, as shown. [Figure 8.1] The ball rebounds with the same magnitude of momentum at an angle θ to the surface. The ball is in contact with the surface for time t. What is the magnitude of the average resultant force acting on the ball during the collision?

Q: What is the correct answer to this A-Level Physics question?

The correct answer is D: 2psinθ / t.

Q: What topic does this question test?

This question tests Dynamics in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Azero

B2p / t

C2pcosθ / t

D2psinθ / t

✓ Correct Answer

The correct answer is D: 2psinθ / t

📋 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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About This A-Level Physics Question

Topic

This multiple-choice question tests Dynamics in A-Level Physics (syllabus code 9702). It is worth 1 mark.

Source

This question appeared in the Cambridge A-Level Physics Feb/Mar 2021 examination, Paper 1 Variant 2.

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