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Å regne med arbeid, energi og effekt

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by

Lene Skilbred

on 11 April 2014

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Transcript of Å regne med arbeid, energi og effekt

Å regne med arbeid, energi og effekt
Bevegelsesenergi (Eb) = 0,5 x m x v2
Eb = bevegelsesenergi = m ∙ v² ∙ 1/2
m = masse = 86 kg
v2 = fart i annen = 10,33 ² m/s

Eb = 86 ∙ 10,33 ² ∙ 1/2
Eb = 4588,5 J

En liten film....
Arbeid (W) = F x s


Stillingsenergi (Es) = m x g x h
m = masse = 55 kg
h = høyde = 604 m
g = gravitasjon/tyngdens akselerasjon = 9,81 m/s²


Es = 55kg ∙ 604m ∙ 9,81m/s²
Es = 325 888 J

Gjennomsnittsfart = Hele strekningen dividert på hele tiden

100 m = 10, 33 m/s
9.68 s

10,33 m/s : 0,278 = 37 km/h



W = arbeid (Joule)
F = kraft = 200 Newton
s = strekning = 2 meter

200N ∙ 2m = 400Nm/J


Effekt (P) = W : t


P = effekt (Watt)
W = arbeid (Joule)
T = tid (sekunder)

400J : 4s = 100W
http://nrk.no/skole/klippdetalj?topic=nrk:klipp/666694
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