Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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<
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377
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ab ipſo proijciente mediatè, vel immediatè, cuius vi deinde mouetur; </
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<
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">at
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qui vnus impetus illud ipſum præſtare poteſt, vr conſtat ex dictis, toto,
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lib. 1. additum eſt, vel niſus ad illam, vt producitur impetus in omni
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pulſione, nec in omni percuſſione; </
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<
s
id
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">cum enim quis pellit ingentem rupem
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ſeu percutit pugno; nullum certè producit impetum, niſi aliqua pars
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auolet, quæ omnia conſtant ex dictis l.1. </
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Definitio
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2.
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Reſiſtentia mobilis eſt illa ratio, que mobili ineſt, cuius vi vel motum omnem
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ipſum mobile ab applicata potentia renuit vel tardiorem tantum permittit.
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<
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<
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">Quid verò ſit illa ratio, & in quo poſita ſit explicabimus infrà; </
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<
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">nihil
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enim aliud nomine reſiſtentiæ intelligi poteſt, quàm id, quo mobile re
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ſiſtit motui; </
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<
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id
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">reſiſtere autem motui, eſt vel totum impedire motum vel
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eius partem, per quid autem reſiſtat, & propter quid dicemus infrà: ſatis
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eſt dixiſſe, quid ſit reſiſtere & reſiſtentia. </
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Hypotheſis.
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<
s
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">Lapis 20. librarum difficiliùs proijcitur, vel ſuſtinetur ab eadem po
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tentiâ, quàm lapis vnius libræ; hypotheſis certa eſt. </
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<
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">Axiomata nulla præmittemus cum Theoremata lib. 1. demonſtrata
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ſufficiant. </
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Theorema
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1.
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Explicari poſſunt omnia phœnomena ſuſtentationis.
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<
s
id
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">Primò, vt manus ſuſtineat pondus in ſitu horizontali producit in ſe
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impetum; </
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<
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id
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">quia, cùm brachium libero motu librari poſſit, ſuo pondere
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deſcenderet, niſi aliquod reſiſteret; </
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<
s
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">ſed ipſum brachium non reſiſtit; </
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<
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">igi
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tur aliquid quod brachio ineſt; igitur impetus. </
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<
s
id
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">Secundò, impetus, quem ipſa potentia motrix in brachio producit,
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non eſt maior impetu grauitationis ipſius brachij; </
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<
s
id
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">quia alioquin præua
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leret; igitur brachium aſcenderet, contra hypotheſim. </
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<
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<
s
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">Tertiò, ille impetus non eſt etiam minor; </
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<
s
id
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N27208
">quia alioqui impetus gra
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uitationis præualeret; igitur brachium deſcenderet, contra hypo
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theſim. </
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<
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">Quartò, hinc ſequitur eſſe æqualem, cùm ſit per n.1.nec ſit maior per
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2.nec minor per 3. ſequitur neceſſariò eſſe æqualem. </
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<
s
id
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">Quintò, ſingulis inſtantibus impetus productus priore inſtanti de
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ſtruitur; probatur, quia quotieſcumque ad lineas oppoſitas ex diame
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tro determinantur duo impetus æquales, deſtruuntur, ſi deſtrui poſſunt
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per Theorema 123.lib.1. at verò impetus innatus deſtrui non poteſt, per
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Theorema 77. libro 2. igitur deſtruitur productus à potentia mo
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trice. </
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<
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<
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id
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">Sextò, propter molliores partes organi, v. g. muſculorum, neruo
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rum, impetus naturalis aliquem ſemper effectum ſortitur, com
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preſſionis, diuiſionis, tenſionis: </
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<
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">ratio eſt, quia anima non produ-</
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