Which statement describes the two forces in a couple?
A They act in the same direction.
B They act through the same point.
C They produce zero resultant force.
D They produce zero resultant moment.
ANSWER: C
The Physics behind the answer:
- A couple is a pair of equal, parallel but opposite forces whose effect is to produce a turning effect on a body without giving it linear acceleration.
- The above means that the forces
- must act in the opposite directions contrary to option A,
- must act at different points contrary to option B, and
- must produce a rotation contrary to option D.
- Furthermore, a zero linear acceleration means zero resultant force. Thus, the answer is C.
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