Exam-style question
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If a pendulum swings from its highest point to its lowest point, what happens to its potential energy?.
- A.It increases.
- B.It decreases.
- C.It remains constant.
- D.It is converted to thermal energy.
Model answer
What a good answer should say
- It decreases.
Explanation
Why this works
As the pendulum swings down, its height decreases, leading to a decrease in potential energy, which is converted into kinetic energy.
Common mistake
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