F,^ll ?r^oh A+ orLL *o A { ovLL to tmovl Ynov(, soyrtathiyr ToWAED YflU $oYnsthi 5 tutAYY nghi sYn t G r&v ) v thql A pr^lls n^etal s 'tooard c- tn&ang+. Friction V ( A {or LL +t^At ATTEACTs 2- ob\ c**s to trr.b[,. o*her. A toree *t"af Slot,ls or $ToP5 rnolian tnrhan L ab\.r,ls &Yt-- in co^t6.a1 fll.r -/ o^e n*her.