Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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acquiſitum
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: </
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">ſint duæ lineæ IK IL, mobili ſcilicet ſtatuto in I; </
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haud dubiè noua linea erit IM; </
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">& quo angulus KIL, erit acutior (ſup
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poſitis æqualibus ſemper lateribus IK IL) Diagonalis IM, erit ma
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ior; </
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<
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">donec tandem IL & IK coeant in eandem lineam; </
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<
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">tunc enim li
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nea erit dupla IK per Th. ſuperius: </
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<
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">quandiu verò eſt aliquis angulus in
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I quantumuis acutus, linea motus erit minor dupla IK, ad quam tamen
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propiùs ſemper accedit; quæ omnia conſtant ex elementis. </
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Theorema
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140.
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Si lineæ duplicis impetus faciunt angulum obtuſum, ſpatium acquiſitum erit
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breuius, & eò breuius quò angulus eſt obtuſior
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; </
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<
s
id
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">ſint enim
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c
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duæ lineæ AD
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AB mobili ſtatuto in A, noua linea erit AC per Th. 137. & ſi accipia
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tur angulus obtuſior HEF; </
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<
s
id
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">noua linea erit EG, eo rectè breuior,
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quò angulus eſt obtuſior, non tamen iuxta rationem angulorum; </
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<
s
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">donec
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tandem deſinat angulus, & ED EF coëant in vnam lineam; </
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<
s
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">tunc enim
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nullum erit ſpatium, quia ſiſter omninò mobile per Th.133.quæ omnia
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ipſa luce clariora eſſe conſtat; </
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<
s
id
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">quippe quæ cum certis experimentis, &
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clariſſimis principiis conſentiant; ſed de his plura infrà. </
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Theorema
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141.
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Ex his neceſſaria ducitur ratio, cur impetus duplus ad diuerſas lineas de
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terminatus non habeat motum duplum, & conſequenter ſpatium duplum
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; </
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<
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">nec
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enim AE eſt dupla AB, vt conſtat; </
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>
<
s
id
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">nam ſi lineæ ſint oppoſitæ ex
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diametro vt BA BE totus deſtruitur impetus, per Th.133. ſi verò vna
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in
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">eandem</
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lineam coëat cum aliâ, nihil impetus deſtruitur, nec impedi
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tur per Th.138. igitur quà proportione propiùs accedet ad oppoſitas; </
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plùs deſtruetur, & minus erit ſpatium; & quâ proportione accedent
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propiùs ad coëuntes, minùs deſtruetur, & maius erit ſpatium, vt conſtat
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ex dictis. </
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Theorema
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142.
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Hinc impetus ad diuerſas lineas determinati it a pugnant pro rata, vt mi
<
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nùs pugnent, quorum lineæ propiùs accedunt ad coëuntes; plùs verò, quorum
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lineæ propiùs accedunt ad oppoſitas, idque iuxta proportiones Diagonalium,
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quod totum ſequitur ex dictis. </
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Scholium.
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<
s
id
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">Obſeruabis vt faciliùs concipias duos impetus ad duas lineas deter
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minatos; </
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<
s
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jectum è naui mobili; ſed de his plura in lib.4. cum de motu mixto. </
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Theorema
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143.
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Impetus ſemel productus, quamdiu durat motus, conſeruatur.
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<
s
id
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"> Probatur,
<
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quia non poteſt eſſe effectus, niſi ſit eius cauſa per Ax. 8. igitur ſi eſt mo
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tus, eſt impetus. </
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Theorema
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144.
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Impetus non conſeruatur à cauſa primò productiua.
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<
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