788 Work and Energy Letr→>0 Cost W=lim∑F;4 rcos 6 Fdrcos0=Fdr B B W=F·dF=| Fcos adr When a particle moves from A to B along a curve path, the total work done by the force equals the integral from a to B7&8 Work and Energy Let r → 0 i i n i r W F r   lim cos 1 0 =  → = Fdr cos b a =  =  b a F dr     =  = B A B A W F dr F cosdr   Fcos A r B dr r r o When a particle moves from A to B along a curve path, the total work done by the force equals the integral from A to B