Generalized applied force xp=x2 +lcos X δxp=δx2-Isin2δ冲2 Virtual work of F Length 2/ δW=Fxp Mass m =Fx2-Flsin2δp2 0 g eLa -mg 2= X F -mg 2 Equilibrium Condition F H2=2,4 3mgl coso +2FIsin=0 3mgl coso +2FIsin=0 FIsin2 +mgl cos,=-FIsin2 2FIsin2 mgl cos2=0Generalized applied force x1 y1 C1 x y f1 g x2 y2 C2 f2 Length 2l Mass m F P 2 2 2 2 2 sin cos   f f f x x l x x l P P     2 2 2  sinf f   F x Fl W F xP         2 sin 0 Fl f A Qv Virtual work of F A v A u T Equilibrium Condition H Q  Q         mg F mg A u 0 Q 2 2 2 1 1 sin cos sin 3 cos 2 sin 0 f f f f f Fl mgl Fl mgl Fl      2 sin cos 0 3 cos 2 sin 0 2 2 1 1     f f f f Fl mgl mgl Fl