Ji38 E)E VEKTVRBATIONE 



angulus ERC menfura \eni motus angularis , qui angulus 

 ERC, qucm ponam —y[ erit — 4)-^-^, qui pcrgentc 

 motu augcbitur , ita vt fit y — CP -f- $. 



§. 7. Vt iam motus centri grauitatis C determinc- 

 tur anibae vires, quibus globi A et B ad O (bllicitantur, 

 in ccntrum grauitatis (lint transfcrendae, in quo finiul vtrius- 

 que mafia collcda concipi dcbet , quae cft~A-hjB» 

 follicitabitur igitur primo pundum C in diredionc ipfi 

 A O parnllcla vi mntrice — ^0» ■> "^"'^^' nafcitur vis in 

 -diredionc COn: Y „" ^ " y\i'm dirccflione CB:^ ^TW^' 

 SimWi modo ob attradionem globi B , ccntrum grauira- 

 tis C (bllicitabitur (ecundum dircAioncm ipfi BO paral- 

 lelam vi nr ^^/. , vndc oritur vis in dirc(5lione C O zr 

 '^-^ et vis in dircdione CA= -|o".''. His collcdis 

 ccntrum grauitatis C primo vrgebitur fecundum diredio- 



ncm CO vi motrice ==/'.OC(;fo'-^ boO — #~(vo^-*"bo')» 

 dcinde vqro vi (ccundum dircdlioncm C A — ^ (j^oi- - 5^51 ) 



$. 8. Has autcm vircs ad dircdioncs conrtantcs, 

 axi OE tum parallclas tum normalcs reuocari oportct : 



atque ex vi ffz (j^t-Hbo») '" diredionc CO (bllici- 



tante rcliiltabit ob angulum KOCrr CP; 



jn dire(flione CP vis zrffz fin <P (xb» ^- ^o"») 



in dirc«ftione Co Vis =:ffz co(. <p(AO»^-roi) 



Porro cx vi ^ (J^. — r^O (ccundum CA vcl CR Vf- 



gente ob angulum ERC— >)r^Cp-hO proucuict 



in dirtaionc CP vis ^zfffm. y\{i,o, — ^») 



in dircdionc Co vis :=/cof >i (Jo, — ^^) 



ficque 



