51 On the Motion of Bodies affected iy F rid ion. 



to its cdse as 32 : 3, and with the same moving- force it 

 described on its flat side 32 inches in 2", and on its edge it 

 described 3 7 inches in the same time. 



Exp. 3. I took another body and covered one of its svu-- 

 faceSj whoseJenath was 9 inches, with a iine rough paper, 

 and by applvinir a nioving force, it described 2.5 niches in 

 s" ; I then took off some paper from the middle, leaving 

 onlv three-eighths of an inch at the two ends, and with the 

 same moving force it described 40 inches in the same time. 



Exi'. 4. Another body was taken which had one of its 

 surfaces, w hose length was g inches, covered with a tine 

 rough paper, and by applying amoving force it described 42 

 inches in 2" ; some of the paper was then taken off from 

 the middle, leaving only 1^ inches at the two ends, and 

 with the same moving force it described 54 inches in 2" ; I 

 then took off more paper, leaving only one -fourth ot an 

 inch at the two ends, and the body then described, by the 

 same moving force, Co inches in the same time. 



In the two last experiments the paper which was taken oft 

 the surface was laid on the body, that its weight might not 

 be altered. 



Exc. j. A bodv was taken whose flat surface was to its 

 edge as 30 : 17; \hc flat side was laid upon the horizontal 

 plane, a moving force was appUed, and the stage was fixed 

 in order to stop the moving force, in consequence of which 

 the bodv .would then go on with the velocity aecpiircx.! until 

 the friction had destroyed all its motion ; when it appeared 

 from a mean of 1 2 trials that the whole body moved, after 

 its acceleration ceased, b\ inches before it stopped. The 

 ed^e was then applied, and the moving force descended 

 tlirough the same space, and it was found, from a mean of 

 the same naniljcr of trials, that the space described was 7? 

 inches before the body lost all its motion, lifter it ceased to 

 be accelerated. 



Exi'. 6. Another bodv was then taken whose flat surface 

 was to its edge as 60 : U), and, by proceeding as before, 

 on the flat sarface it described, at a mean of 12 trials, 3y 

 inches, and on the edge Q\\ inches, before it stopped, after 

 the acceleration ceased. 



Exp. 7. Another body was taken whose flat surface was 

 to its .edge as 20 : 3, and the spaces described on these 

 two surfaces, alter the acceleration ended, were, at a mean 

 of 10 trials, 4 ^ and 7:,' inch?s respeciivcly. 



From all ihese diflercnt experiments it appears that the 

 snndlest surface had always the least friction, which agrees 

 with the eousecpeuce deduced from the eQasideri.\liou tliat 



the 



