## Full text: Gravesande, Willem Jacob: Physices elementa mathematica, experimentis confirmata, sive introductio ad philosophiam Newtonianam

PHYSICES ELEMENTA nim quidam neceſſario motuspro parte conſpirant, aut con-
trarie agunt; de his nihil demonſtravimus, ex eadem tamen
theoria virium deduci poſſunt.

608.
TAB. XXIII .
fig. 4. 5.

## 236.CAPUT XXVI.De Percuſſione obliqua. Definitio 1.

ANgulus incidentiæ vocatur angulus quem directio motus
corporis, ad aliud accedentis, efficit cum perpendicula-
ri ad ſuperficiem hujus in puncto, in quo percutitur.

609.

## 237. Definitio . 2.

Angulus reflexionis eſt angulus, quem cum eadem per-
pendiculari efficit directio motus corporis poſt percuſſio-
nem.

### 237.1.

610.

Si Corpus elaſticum P in obicem firmum elaſticum FG in-
currat, obliquè juxta directionem P a, redibit per a p, i-
ta, ut angulus incidentiæ P a B æqualis ſit angulo reflexio-
nis B a p. Motus per P a, quam longitudine celeritatem
corporis deſignare ponimus, poteſt reſolvi in duos, quorum
unius directio parallela ſit lineæ B a, alterius huic perpen-
dicularis; & corpus in obicem incurret in a, quaſi celeritati-
bus C a, B a, & juxta haſce directiones, ad hunc accederet *. Motus per C a ictu non mutatur & celeritate a E corpus
motum continuat, poſitis C a, a E æqualibus; motu per
B a directè in obſtaculum incurrit, & per eandem lineam,
ea qua acceſſit celeritate redit , id eſt per a B; hiſce au- tem duobus motibus agitatum corpus redit per a p, diago-
nalem rectanguli lineis a E, a B, formati ; Triangula ve- rò BP a, B a p eſſe æqualia liquet, unde conſtat propoſi-
tum. Simili methodo detegimus motus corporum oblique
in ſe mutuo impingentium.

### 237.1.

611.
TAB. XXIII .
fig. 6.
604.
559.
246.

Corpus Q quieſcit, corpus P, directione & celeritate
PA, in illud impingitur. Per centra amborum corporum,
cum P in A pervenerit, ducatur linea DB, & ad illam

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