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Resolution of a Force into a Force and a Couple

RESOLUTION OF A FORCE INTO A FORCE AND A COUPLE

 

Fig. 3.14(a) A force F is acting at point A in the plane.

Fig. 3.14(b) à  At point B, two forces F and- F are acting. (the net external effect on the body remains the same)

Fig. 3.14(c) à  At point B, there is a force F and a clockwise moment M =- Fx, because- Fat                       Band F at A constitute a couple whose magnitude is Fx. The sense is clockwise.