'Bodies nJfccieJ by Fyidtion, 169 



^age was then ndjufted to the fpace correfpondlng to 3'^ upon 

 iuppofitioii that the fpaces defcended through were as the 

 fquares of the times, and it was found to agree with the time ; 

 the ftage was then adjufted to the fpace correfponding to 2'\ 

 upon the fame fuppofition, and it was found to agree with the 

 time ; the ftage was then adjufted to the fpace correfponding 

 to i'\ and was found to agree with the time. . 



Exp. 4. A fourth body was then taken and laid upon the 

 horizontal plane, and a moving force applied, which defcended 

 "55 inches in 4'^ ; the ftage was then adjufted to the fpace 

 through which it ought to defcend in 3'% upon fuppofition 

 that the fpaces defcended through were as the fquares of the 

 times, and it was found to agree with the time ; the ftage was 

 then adjufted to the fpace correfponding to z"^ upon the fame 

 fuppofition, and was found to agree with the time ; laftly, the 

 ftage was adjufted to the fpace correfponding to i''', and it wa^ 

 found to agree exadly with the time. 



Befides thefe experiments, a great number of others were 

 made with hard bodies, or thofe wbofe parts fo firmly cohered 

 as not to be moved inter fe by the friction ; and in each experi- 

 ment bodies of very different degrees of fri6lion were chofen, 

 and the refults all agreed with thofe related above ; we may 

 therefore conclude, that ihefriBion of loard bodies in motion is a 

 uniformly retarding force. 



But to determine whether the fame was true for bodies when 

 covered with cloth, woollen, &c. experiments were made in 

 ©rder to afcertain it ; when it was found in all cafes, that the 

 retarding force increafed with the velocity ; but, upon covering 

 bodies with paper, the confequences were found to agree with 

 thofe related above. 



Vol. LXXV-. 7* 4. Having 



