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# Title: Phoronomia, Sive De Viribus Et Motibus Corporum Solidorum Et Fluidorum Libri Duo (shelfmark Leibn. Marg. 182)
# Folio 111, page id 1066518432:0139
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in
DE VTRTBOS EF NIOTTBOS CORBORDM. EIB. L. TFY
III.
212. Corpora A, B in planis horizontalibus moveri acque inter
se collidi intelliguntur ad id, uc motus corum ante e polt Occur-
Cum aequabiles cradtant, nec iidem motus a gravitatis actione a pla-
no uepore sustaminanda, in quo mobilia incedune, quicquam alte-
rentur. Celeritates mobilium proprix ante occursum designabuntur Fi8. 48.
Potthac per lineas rectas AD, BD in iplorum directionibus fumtas,
adeo ut quocunque modo mobilia A, B, incedant; dummodo non
in rectis angulum continentibus ferantur, ipsorum celeritas rolati-
ra FIITUTA SIE AB. Directiones rero particulares corporum, aut pO-
tius directionum plaga, designentur deinceps per ordinem, quo lite
Ex A, D et B, D Scribuntur. Proinde AD significat mobile A Fer-
ri celeritate uniformi AD ex A vertus D, e B Ferri relocitate hac
linea BD expressa ex B etiam rersus D. Adeoque quoties signum
D inter A e B cadic, toties ambo haec corpora contrario sensumo-
ventur, id est, ex oppolitis partibus sibi invicem obriam reniunt ce-
leritate relatira AB, quae hoc casu composita est ex parricularibus
AD, BD; Sin vero signum D cadit extra AB, ambo cOrpOra MO-
rebuntur ad eandem partem, in qua signum D positum est celerita-
te relatira AB aequali in tali catu excestui relocitatis propria al-
teruerius mobilis supra celeritatem propriam alterius.
213. Ft quia motuum plagx etiam per signa + e = (ubinde de-
signari Colene, probe sciendum + AD idem eNO aC =D A, _C + DA
idem ac = AD, e Sc de cereris. Nam OtuI = AD contrarius CA,
seu in plagam contrariam dirisitur, cum =AD, cum etiam DA, at-
que adeo hxe duxe expressiones sunt aequiralentes; parirer quia
ec + DA e - AD eidem motui L AD contrarii CunE, nOtaLIONCS +
DA _ = AD unum idemque significant, adco ut una alteri semper
sufticere liceat, quod aliquando bene notatum, utile esse compe-
TICEUT.
214. Celeritates cosporum litee le colorum ance contlictum
considerabimus quandoque tanquam acquisicas laptu rerticali a
quiete incepto motu grarium naturaliter accelerato; e celeritates
eorundem post occurtum tanquam relocitates initiales corporum,
quae verticaliter in altum lata motu naturaliter retar dato certas al-
cicudines emeteri ralen privoquam mocus eorum alcentionalis peni
cus extinguatur.