Engineering Mechanics Practice Exam

What refers to a pair of equal, opposite and parallel forces?

Couple Moment Torque All of the above

Correct Answer:

Couple

Explanation:

A couple is a pair of equal, opposite and parallel forces whose lines of action are distinct. The forces cancel in translation, giving zero resultant force, but because they act apart from each other they produce a pure rotation. The turning effect, or moment, is equal to the force magnitude times the perpendicular distance between the lines of action (M = F × d). Moment (or torque) describes that rotational effect, but the term that names the two forces together is a couple.

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