v ' ri.r. MAY BB TUAX1FKEKED. ' 



// bUccting each other at Q. ,ppiy 



two equal ;o*ite force* each - /', -r /' and |rai 



the effect of the couple. 



'. are equiva *P t acting at O in 



the <i ; .u.iH- 1 ; and 



/', air ci 'lie oppo 



.' /',. '. nn in equilibrium with each other; 



1 force* jR and A acting at .1* and /T 

 retpN fleet an /', and /', a< 



I" i ' 



Tke effect of a roitple u no* altered / K* rtplacf it fy 

 OHOtnff OMQHv OJ tOMfcA CM MOM^Mf * tmf Mtattf ; 



< ff/f </M.' r .'/', (.T;- ' ( / i . .''.' 



/IJM and having a o>/nm//i 



Let AD be the arm 

 P be the force*, and snppoae 

 P=Q + R;\etAH = 



new arm AC b; ; 

 apply two opposite force* each 

 and parallel to 



will imt | the .. 



:>le. 



v at A and C at C will balance <? + fl at /?, 



if. I/; 7/f?s ^ : 12, (Art 37), 

 or '.> : - -8. 



that i* t if Q .l-F.a\ 



we have then remaining the couple Q, Q acting on the arm 

 AC. II '. P acting on ^# maj be rrplacrd 



l.v tiu couple Q, Q acting on AC, if Q. ft -/>., that U, if 



their iii"! 



1 laat three Article* it appears that, 



a couple, we ma/ chaugt 



