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Arbeid en energie
Mechanica
Examenstof VWO * HAVO ^
Arbeid en energie
* ^
Kinetische energie
E
k
= 1/2 m v
2
* ^
Zwaarte energie
E
z
= m g h
E
k
[J]
=
E
z
[J]
=
m
[kg]
=
m
[kg]
=
v
[m s
-1
]
=
h
[m]
=
* ^
Arbeid
W= F s cos
α
W
[J]
=
F
[N]
=
s
[m]
=
α
[deg]
=
* ^
Wet van arbeid en kinetische energie
Σ W = 1/2 m v
2
2
- 1/2 m v
1
2
Σ W
[J]
=
m
[kg]
=
v
2
[m s
-1
]
=
v
1
[m s
-1
]
=
* ^
Rendement
η = (W
uit
/ E
in
) 100%
η
[-]
=
W
nutt
ig
[J]
=
E
in
[J]
=
* ^
Vermogen
P = F v
* ^
Vermogen
P = Δ E / Δ t
P
[W]
=
P
[W]
=
F
[N]
=
Δ E
[J]
=
v
[m s
-1
]
=
Δ t
[s]
=
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