Martin, Louis Adolphe, 1880- · New York, J.Wiley & Sons, Inc.: [etc. etc.] · leaf 147
r polygondirectly under the bar. From these polygons we derivethe magnitudes of the reactions cd and da. 128 GRAPHICAL STATICS As this bar is in equilibrium the sum of the momentsof all the forces acting on the bar about any point, A,must be zero. Thus, the sum of the moments of theforces to the… … FlG. 164 hand end counter-clockwise about A. The measure ofthis tendency to bend the beam at A is called the bend-ing moment, or simply the moment, at A, and it is equal tothe sum of the moments of the forces, either to the leftor to the right of A, about A.In Fig. 164 this moment would be M=-Rix +…
Mechanics
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