Statics › Section D · Moments and static equivalence › Topic D.5
Couples
Turn a steering wheel with both hands and you push one way with one hand and the other way with the other. That pair of forces cancels as a push but adds as a turn: it is a couple, a pure moment that is the same about every point of the body.
In this topic
- Two hands on a wheel
- What a couple is
- The couple moment
- The same about every point
- A free vector
- Equivalent couples
- Worked example: a tap wrench
- Couples in a moment sum
- Couples in three dimensions
- Worked example: a couple in 3D
- Common mistakes to avoid
- Key takeaways
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