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Samenvatting fysica: arbeid, energie en behoud van energie
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fysica vierde middelbaar ASO arbeid, energie en behoud van energie
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FysicaThema 1- arbeid
Eenheid W= Joule
Een kracht verricht arbeid op een voorwerp als:
- De kracht op het voorwerp werkt.
- Het voorwerp zich verplaatst volgens een richting die niet loodrecht is op
de richting van de kracht.
W= F. Δx (als F en Δx dezelfde zin hebben)
W= -F. Δx (als F en Δx tegengestelde zin hebben)
Arbeid berekenen op de zwaartekracht: Wz= m.g.h
W<0 tegengestelde zin
W>0 dezelfde zin
W=0 Δx= 0/ F⊥ Δx
Thema 2- energie
E= Joule
Een voorwerp bezit energie als
- Het arbeid kan verrichten
Kinetische energie
Ekin= 1/2m. v2
Potentiële energie
1. Potentiële gravitatie energie
Epotg= m.g.h
Potentiële elastische energie
Epotel=1/2k.(Δl)2
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