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Samenvatting Natuurkunde Krachtenwetten HAVO

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Natuurkunde samenvatting over het onderwerp krachtenwetten. Deze samenvatting is voor leerlingen uit 4/5 Havo.

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Hoofdstuk 4 krachtenwetten.
Formules:
Tweede wet van Newton: Fres = m x a Fres = de resulterende kracht in N
m = de massa in kg
a = versnelling in m/s2

Resultante kracht fiets: Fres = Ftrap - Fw,rol - Fw,lucht.

Resultante kracht Fres = Fz - Fw

Moment van een kracht: M=Fxr M = moment in Nm
F = kracht in N
r = de arm in meter.

Moment: M1 = M2 M1 = moment linksom in Nm
M2 = moment rechtsom in Nm

Hefboomwet F1 x r1 = F2 x r2 F1 = de eerste kracht in N
r1 = de arm F1 in m.
F2 = de tweede kracht in N
r2 = de arm van F2 in m

Afstand: s = 0,5 x a x t2 s = afstand in cm
a = versnelling m/s2
t = tijd per seconde.
Hoogte h = 0,5 x(∆t) x (∆v) h = hoogte in m




4.1 de eerste wet van Newton.
Als er op een voorwerp een of meerdere krachten werken, kan deze:

 Vervormen. Bv: als een auto tegen een boom rijdt, raak de auto vervormd door de
krachten die erop werken.
 Op zijn plaats blijven. Bv: op een schilderij dat aan een spijker aan de muur hangt,
werkt de zwaartekracht. De kracht die de spijker uitoefent op het schilderij voorkomt
dat het naar beneden valt.

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