c 188 ) 
VII. Remarks upon a fuppofed Demonflration, that 
the moving Forces of the fame Body are not as 
the Velocities^ but as the Squares of the VelocU 
ties^ By the fame, 
HE DemonEration runs thus : “ Concipiocor- 
^ “ pus C inovcri oblique in elaflrum L, ve- 
“ locitate C L ut 2, angulo inclinacionis CLP exiiknte 
“ 50 gr. cujus nempe finus CP eft femillis radii CL. 
“ Suppono autem earn efte refifteotiam in elaftro, uc 
“ ad illud tcndendum requiratur prsecise unus velocita- 
“ tis gradus in illo corpore, ft perpendiculariter irn- 
“ pingeret. Quid ergo jam ftet poft incurftonem ob- 
“ Lquam corporis C in elaftrum L ? Quoniam motus 
“ per C L componitur, ut notum eft, ex duobus colla- 
“ teralibus per C P & PL, & cum C P, fecundum 
“ quam corpus direde impingit in elaftrum L, expn- 
“ mit dimidiam celeritarem corporis per CL, confume- 
tur hie motus per C P, tenlo elaftro (perinde enim eft 
“ fet, ac ft corpus C ccleritace C P perpendiculariter 
“ incurreret in elaftrum, quod per Hypotheftn, earn 
celeritatem deftruere poftet; remanente corporis ce- 
“ leritate, & direeftione P L. Produdta igitur PL in 
“ M, ita ut L M fit =PL='/3 (ponitur enim C L 
“ =- l ) & applicato in M alio ftmili elaftro faciente 
cum LM angulumL MQ, cujus finus L Q=CP= 
“ I, per eandem racionem manfteftum eft corpus C, 
“ poft tenftonem elaftri L, tenlurum efte elaftrum M, 
“ amilfo motu per L Q, & fervato motu per QVI. 
‘‘ Prolongata itaque QlVI ad N, ut fiat MN = QM 
