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Work, energy, power
Work, energy, power
7 formulas · Physics
Mechanical work
W
=
F
s
cos
α
W=F s\cos\alpha
W
=
F
s
cos
α
Kinetic energy
E
k
=
1
2
m
v
2
E_k=\tfrac12 m v^2
E
k
=
2
1
m
v
2
Gravitational potential energy
E
p
=
m
g
h
E_p=mgh
E
p
=
m
g
h
Elastic potential energy
E
=
1
2
k
x
2
E=\tfrac12 k x^2
E
=
2
1
k
x
2
Conservation of mechanical energy
E
k
+
E
p
=
const
E_k+E_p=\text{const}
E
k
+
E
p
=
const
Power
P
=
W
t
=
F
v
P=\dfrac{W}{t}=Fv
P
=
t
W
=
F
v
Efficiency
η
=
W
u
W
d
⋅
100
%
\eta=\dfrac{W_u}{W_d}\cdot 100\%
η
=
W
d
W
u
⋅
100%
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