Exam-style question
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How does the distance between the forces in a couple affect its turning effect?.
- A.Increasing the distance decreases the turning effect.
- B.Decreasing the distance increases the turning effect.
- C.Increasing the distance increases the turning effect.
- D.The distance does not affect the turning effect.
Model answer
What a good answer should say
- Increasing the distance increases the turning effect.
Explanation
Why this works
The cause is the distance between the forces in a couple. The mechanism is that a greater distance increases the moment arm, which enhances the torque produced by the couple.
The effect is a stronger turning effect, which can lead to more efficient rotation of the object.
Common mistake
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