Martin, Louis Adolphe, 1880- · New York, J.Wiley & Sons, Inc.: [etc. etc.] · leaf 66
rce, is calleda couple. As shown a couple can-not be reduced to a singleforce, and its actiontherefore is not that ofa force. It thus becomesimperative to study morefully the properties of couples. The tendency of a couple is to cause rotation. Thisis illustrated in the operation of a screw… … A and draw the hne Oah per-pendicular to the lines ofaction of the forces F.The sum of the monSAsof the forces about * is-F(aO)+F{hO)=FihO-aO)=F{ah). The distanceah is called the arm of thecouple, and we have shownthat the moment of theco-uple [F{ah)\ about any point in its plane is the prod-
Mechanics
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