*$6 DE FRICTIONE 



38. Hinc igitnr pro motu cafas fecundi hanc 

 nancifcimur conclufionem : 



fi fuerit 



?ggCinJcoC&+Qkk-\-ggcoM i )-VghCm.Q<Zl{(^Cm.ko('.$ 



-±-?(kk-\-ggCm.9~j+Vgbco(J) 

 atque infupcr Qjrfm.Q-\~V b)>?gcoi.$ 

 tum corpus circa extremitatem bafis G immotam in 

 plagam BCD moueri incipere , fbreque accelerationem 

 huius motus gyratorii pro diftantia g, 



- £ (Q ^fi" &~Vg coC&-±-Vb)_ 



Si eueniat vt fit Qg fin. -h V b <i ?g cof. .0 , minime 

 concludere licet, motum gyratorium fieri in plagam op- 

 pofitam circa G ; tali enim motui pars reliqua bafis G H 

 plano innitens fcfe opponit. Namque motus contra- 

 tius fuerit circa alteram bafis extremitatem H, pro quo 

 cafu peculiari calculo refpondentes vires Z, et Y 7 qua- 

 rum haec iam in H applicata eflet eoncipienda , dcfi- 

 niri oporteret , fimili quidem modo quo hic fianus 

 vfi. 



39. Si ergo fit QgfinJ -{-V hzz?gcof nul- 

 lus dabitur motus gyratorius; vt antem fimul pundhim 

 G quiefcat , requiri, vt fit Q<^ \ P , hocque ergo cafu 

 corpus plane quiefcet. At fi fit Qgfin. # + V h > P^ cof.0 , 

 feu acceleratio .« pofitiuum obtineat valorcm , tum 

 corpus motum gyratorium circa G adipifcetur \ vt au 

 tem pundum G quiefcat, oportet fit valore ipfius v in- 

 iroducto : 



Q.< -; P H- M « (fin J -J- \ cof. 0) 



<Juando 



