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Physics
General Physics
Energy
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Robin Jack
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Cards (18)
Energy
:
amount of work and its measured in Joules (J)
An object may have
energy
due to its motion or its position
Conservation
of
energy
: energy cannot be created or destroyed, when work is done, energy is changed from one form to another.
Energy
can be stored
Kinetic energy is due to
motion
Gravitational energy is from potential to
fall
Chemical energy is in
chemical bonds
Strain energy is
compress
/
stretch
Nuclear energy is atoms
rearranged
/
split
Internal energy is
motion
of
molecules
Electrical energy is carried by
electrons
Light energy is carried in
light waves
Sound energy is carried in
sound waves
What are the types of energy?
Kinetic
Gravitational
Chemical
Strain
Nuclear
Internal
Electrical
Light
Sound
The formula for
kinetic energy
is:
K
i
n
e
t
i
c
e
n
e
r
g
y
=
Kinetic\ energy\ =
K
in
e
t
i
c
e
n
er
g
y
=
1
2
x
M
a
s
s
x
V
e
l
o
c
i
t
y
2
\ \frac{1}{2}\ x\ Mass\ x\ Velocity^2
2
1
x
M
a
ss
x
V
e
l
oc
i
t
y
2
or
1
2
m
v
2
\frac{1}{2}mv^2
2
1
m
v
2
Gravitational
Potential
Energy
=
Mass
×
Gravity
×
Height
Due to the processes through which
energy transfers
take place not being 100% efficient, energy is lost to the surrounding and therefore energy gets more spread out (
dissipated
)
Efficiency
=
U
s
e
f
u
l
E
n
e
r
g
y
O
u
t
p
u
t
E
n
e
r
g
y
i
n
p
u
t
x
100
\frac{Useful\ Energy\ Output}{Energy\ input}\ x\ 100
E
n
er
g
y
in
p
u
t
U
se
f
u
l
E
n
er
g
y
O
u
tp
u
t
x
100
=
U
s
e
r
f
u
l
P
o
w
e
r
O
u
t
p
u
t
P
o
w
e
r
i
n
p
u
t
x
100
\frac{Userful\ Power\ Output}{Power\ input}\ x\ 100
P
o
w
er
in
p
u
t
U
ser
f
u
l
P
o
w
er
O
u
tp
u
t
x
100