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Fysikk formler

Fysikk begreper

fartsformelen v = v0 + at
Veiformel 1 s = 1/2(v0 + v)t
veiformel 2 s = v0t + 1/2at^2
Tidløs formel v^2 = v0^2 + 2as
Newton 1 ƩF = 0, da er farten konstant
Newton 2 ƩF = ma, (m i kg, a i m/s^2)
Newton 3 F* = F
massetetthet P = m/V
Arbeid når kraft og vei har samme retning W = F * s, enheten er Joule
Arbeid med vinkel W = Fs . cos a
Effekt, Effekt og fart P =W/t , P = Fv
Formel for Kinetisk energi Ek = 1/2mv^2
Setningen om kinetisk energi WƩF = 1/2mv^2 - 1/2mv0^2 = Delta Ek
Formel for potensiell energi Ep = mgh
setningen om fritt fall, uten innvirkning av friksjon og luftmotstand (mekanisk energi bevart) 1/2mv^2 + mgh = 1/2 mv0^2 +mgh0
Mekanisk energi ikke bevart E = E0 +Wa -- 1/2mv^2 + mgh = 1/2 mv0^2 +mgh0 + Wa
Friksjon u = R/N = friksjonstallet = Friksjonskraft/Normalkraften
Friksjonsarbeid WR = -Rs
Luftmotstand L=kv^2
Created by: timmyrobin