Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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1
Cap. 10. de
æquitempo­
ranea natu­
rali veloci­
tate grauium.
Hinc deducitur, quòd figura acuminata eiuſdem̨
corporis grauis omninò inutilis eſt, nec motum eius
facilem reddit, quando motus fieri debet in ſpatio
prorsùs inani, non verò in medio fluido quieſcente;

propterea quòd vis motiua eius naturalis nullam me­
dij reſiſtentiam ſuperare debet, ſcilicèt neque medij
fluidi quieſcentis ibi non exiſtentis, inertiam, aut
grauitatem, contiguitatem, aut glutem ſuperare de­
bet, ſcilicèt quando nihil ei obſiſtit, nec eius impetum,
aut progreſſum impedire, & retardare poteſt.
III.
IV.
E contrà figura obtuſa, & ampla eiuſdem corpo­
ris grauis nihil nocet, nec planè retardare poteſt mo­
tum eiuſdem corporis grauis in vacuo, quia nimirum
nihil ei reſiſtit, neque enim inertiam medij fluidi quie­
ſcentis ibi non exiſtentis ſuperare debet, id è ſuo lo­
co expellendo, neque eius grauitatem, contiguitatem,
aut gluten ſua vi motiua vincere debet.
V.
Cùm velocitates grauium cadentium non ſint æqua­
biles, ſed vniformiter acceleratæ, ideò quando com­
parantur inter ſe gradus velocitatum duorum corpo­
rum deſcendentium, intelligi ſemper debent gradus
initiales, ſcilicèt illi, qui ab eodem termino quietis
temporibus æqualibus exercentur, & vniformi pro­
greſſu creſcunt.
His præmiſſis demonſtrari poſſunt ſequentes pro­
poſitiones.
149[Figure 149]

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