1. couple (of forces)
Wikipedia definition
2. Couple (mechanics)In mechanics, a couple is a system of forces with a resultant (a.k.a. net, or sum) moment but no resultant force. Another term for a couple is a pure moment. Its effect is to create rotation without translation, or more generally without any acceleration of the centre of mass. The resultant moment of a couple is called a torque. This is not to be confused with the term torque as it is used in physics, where it is merely a synonym of moment. Instead, torque is a special case of moment.
Read “Couple (mechanics)” on English Wikipedia
Read “偶力” on Japanese Wikipedia
Read “Couple (mechanics)” on DBpedia


to talk about this word.