CHAPTER IV. 



RESULTANT OF FORCES IN ONI . C..M.ITIONS OF 



EQU 1 LIBttl UM. MOM ENT8. 



62. To find the resultant of any number of parallel forces 

 tid body in one plane. 



, P 3 denote the forces. Take any point in 



Let P 



the plane of the forces as origin and draw rectangular 



in- latter parallel to the forces. I. tin- point 



.-ets the direction of P |f and let "J, x^. 



Apply at two forces each equal and parallel to 7' 1? in 

 opposite directions. Thus the force J\ is replaced by P t 

 at along 6ty, and a couple of which the moment is 1\ . OA lt 

 Transform the other forces in a similar manner, 



that is l\>JC 



