Exam-style question
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What happens to the amplitude of a pendulum's oscillation when damping is applied? Scenario focus: use simple harmonic motion in a distinct A-Level Physics context and identify the relevant physical quantity before choosing the answer.
- A.Amplitude increases
- B.Amplitude decreases
- C.Amplitude remains constant
- D.Amplitude becomes zero
Model answer
What a good answer should say
- Amplitude decreases
Explanation
Why this works
The correct answer is Amplitude decreases. This option is correct for Periodic motion because it applies the simple harmonic motion idea in the stem and keeps the relevant quantity, unit, and physical conclusion together.
The alternatives either use a neighbouring formula, omit a required variable, or describe a different physical situation.
Common mistake
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