n a rigid body in thesame plane they will be in equilibrium if both of the followingconditions are satisfied :— (1) The algebraic sum of the forces resolved in any two directions must vanish. (2) The algebraic sum of the moments of the forces about any point in their plane must vanish. 60.… … Fig. 27. Since — B, P, Q are in equilibrium, we have (Art. 59) (1) Resolving in direction AP, -B^ P+Q = 0; . •. R = P+ Q. (2) Taking moments about C , PX AC=Qx BO .. AC = ^ JV^^ . CENTRE OF GRAVITY. 62. If the weights of the component particles of a body betaken to be parallel, their resultant…
Mechanics
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