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Dane: Szukane:
m=2kg W=?
h₁=1m
h₂=2m
W=Fxs
F=mxg=2kg x 10N/kg=20 N
s=h₂-h₁=2m-1m=1m
W=20N x 1m=20 J
zad.2
Dane: Szukane:
F₁=20 N W=?
s₁=10m
s₂=5m
F₂=10N
W=W₁+W₂
W₁=F₁xs₁=20N x 10m=200J
W₂=F₂xs₂=10N x 5m=50J
W=200J + 50J=250J
zad.3
Dane: Szukane:
F=150N h=?
W=3000J
h≈s
W=Fxs
s=W/F=3000J : 150N=20m
h=20m
zad.4
Dane: Szukane:
P=5kW=5000W F=?
s=5m
t=5s
W=Fxs
P=W/t=Fxs/t
F=Pxt/s=5000W x 5s / 5m=25000 Wxs / 5m=5000N