Martin, Louis Adolphe, 1880- · New York, J.Wiley & Sons, Inc.: [etc. etc.] · leaf 60
forces acting upon a par-ticle are in equilibrium, thealgebraic sum of their momentsabout any point will be zero. To prove this proposi-tion consider the forces Fi,F2, . . ., Fig. 38, to be inequilibrium, and O any ori-gin of moments. We mustnow prove i^i«^i+-P2^2 + .. . = 0. Join O and A and find… … But sm^i-^^, sm^2 ^^, Therefore j^ di ^ dz^OA+^OA^---- and Fidi+F2d2 + . . .=0: or -^ moment = IM = o. 42 ANALYTICAL STATICS
Mechanics
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