Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              uato
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              ; quia vel eſt productus de nouo, vel præuius, per Th. 4. non pri­
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              mum per Th.8.igitur eſt præuius. </s>
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              Theorema
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              10.
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              Hinc potentia motrix, quæ priùs impegit mobile in corpus reflectens eſt cau­
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              ſa huius motus reflexi
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              ; </s>
              <s id="N1F2A7">quia ſcilicet eſt cauſa impetus, vi cuius mobile
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              mouetur etiam motu reflexo; hinc qui ludit pilá, verè dicitur cauſa re­
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              flexionis pilæ, cauſa inquam, ſed mouens. </s>
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              Theorema
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              11.
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              Corpus reflectens dici poteſt aliquo modo cauſa reflexionis, id eſt, cauſa no­
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              uæ determinationis lineæ motus
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              ; niſi enim occurreret paries. </s>
              <s id="N1F2CA">v.g. non re­
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              flecteretur pila; quamquam dici debet potiùs occaſio, immò impedi­
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              mentum prioris lineæ, ex quo neceſſariò ſequitur noua linea, ve dicam
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              infrà. </s>
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              Theorema
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              12.
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              Hinc habetur veriſſima cauſa reflexionis
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              ; </s>
              <s id="N1F2EF">cum enim impetus non con­
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              ſeruetur à cauſa primò producente, vt ſæpè dictum eſt ſuprà, nec deſtrui
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              poſſit ſaltem totus à corpore reflectente; </s>
              <s id="N1F2F7">certè debet ſuum motum vlte­
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              riùs propagare; </s>
              <s id="N1F2FD">igitur per aliquam lineam; quomodo verò determine­
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              tur linea reflexionis, dicemus infrà. </s>
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              Theorema
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              13.
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              Hinc non destruitur totus impetus in puncto reflexionis.
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              <s id="N1F31A"> Probatur primò,
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              quia motus reflexus eſt ab impetu per Th. 3. ſed non producitur nouus
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              impetus per Theorema 8. igitur eſt impetus, qui erat ante reflexionem
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              per Th.9. igitur non deſtruitur totus, ſaltem per ſe, in puncto reflexio­
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              nis. </s>
              <s id="N1F325">Probatur ſecundò à priori; </s>
              <s id="N1F328">quia nunquam deſtruitur impetus, niſi
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              quando eſt fruſtra per Ax.3.ſed corpus reflectens non facit, vt ſit fruſtrà,
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              quia non impedit omnem lineam motus; </s>
              <s id="N1F330">igitur ſi ad aliquam determi­
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              nari poteſt, impetus non erit fruſtrà: ad quam autem determinari de­
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              beat, dicemus infrà. </s>
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              <s id="N1F33A">Dixi, non deſtruitur totus impetus; </s>
              <s id="N1F33E">quia fortè aliqua pars illius de­
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              ſtruitur in reflexione vt demonſtrabo, ſcilicet per accidens: dixi præterea
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              per ſe, quia per accidens poteſt accidere vt totus impetus deſtruatur pro­
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              pter mollitiem vel corporis reflexi, vel propter aliam cauſam, de quo
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              aliàs. </s>
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              Theorema
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              14.
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              Ex hoc etiam habetur impetum non eſſe ſucceſſiuum ſed qualitatem perma­
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              nentem eamque durare, licèt à cauſa primò producente non conſeruetur ſed ab
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              alia
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              ; vt iam alias demonſtrauimus. </s>
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              Theorema
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              15.
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              </s>
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              <s id="N1F377">In omni reflexione determinatur noua linea motus; </s>
              <s id="N1F37B">clarum eſt, quia
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              non eſt motus ſine linea determinata, vt patet; </s>
              <s id="N1F381">ſed non remanet prior </s>
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