Exam-style question
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What happens to an object when a couple is applied?.
- A.It moves in a straight line.
- B.It rotates about a fixed point.
- C.It remains stationary.
- D.It experiences a change in mass.
Model answer
What a good answer should say
- It rotates about a fixed point..
- the correct option
Explanation
Why this works
The correct answer is It rotates about a fixed point.. This supports Describe the turning effect of a couple.
in Moments because it uses the required mechanics relationship directly. The other options are less suitable because they confuse a different force, motion, energy, momentum, or materials concept.
Common mistake
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