Exam-style question
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In a couple, what is the relationship between the forces applied?.
- A.They are unequal and act in the same direction.
- B.They are equal and act in opposite directions.
- C.They are unequal and act in opposite directions.
- D.They are equal and act in the same direction.
Model answer
What a good answer should say
- They are equal and act in opposite directions.
Explanation
Why this works
The cause of a couple is the application of two equal forces that act in opposite directions. The mechanism is that these forces create a rotational effect without resulting in linear motion.
The effect is that the object experiences a torque, leading to rotation about a pivot point.
Common mistake
No common mistake is linked to this question yet.