Kinetic energy
E
k
= 1/2 m v
2
E
k
[J]
=
m
[kg]
=
v
[m s
-1
]
=
Gavitational potential energy
E
z
= m g h
E
z
[J]
=
m
[kg]
=
h
[m]
=
Work
W= F s cos
α
W
[J]
=
F
[N]
=
s
[m]
=
α
[deg]
=
The Work - Energy Theorem
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
]
=
Efficiency
η = (W
/ E
) 100%
η
[-]
=
W
[J]
=
E
[J]
=
Power
P = F v
P
[W]
=
F
[N]
=
v
[m s
-1
]
=
Power
P = W / t
P
[W]
=
W
[J]
=
t
[s]
=