Uploaded by Teddy Susanto

Lecture7 Energy

advertisement
Lecture7 Ene
kin
E
Yi Yelena
p
s
Recall Galileo's experiment
N
demo
total energy
peg pendulum
is conserved
i
constant in
e
MF
r
ph
Ms
K
E
unit
total energy
is
Joules
depends on
system
U
t
kg m
time
r
kinetic energy t potential energy
enemy
eneozsp.bg jimrtue
U
E
xx
x
a
attest
m
The notion of
force
Irest
i
comes
from energy
F
uan
iii ki
I
apt
f Co
X
Some example potentials
Un
Fuooke
IKE
a
Kx
a
4
mgy
Usafa
Fgrow
Earth
my
a
y
demo
vertical
cannon
GIM
UEY.ae
Foggia
Gmr
u
f
eg
loop the
loop
energy conservation
Emv
centripetal force
mf
Eff
HH
demo
mgh
mg
Ih
loop the loop
Wort
Let
us
define
a
useful concept
C
amount of energy transferred
to an object via a force
W
af
Fdx
Ma
d
1
initial
UCB
so
W
n
I
energy gained
e
g as kinetic
UCA
04
Ou
n
I
energy
lost
in potential
This gets
more complicated beyond one dimension
af F
W
di
yd
V
7
F
d
EEivears
iii
iii
Powers
P
did
work
in
demo
per
watts
small explosive
time
Toute
she
Energy
and power
energy of
a
all
6
needed for
household
for
energy
weapons
over
range
immense scales
million tons
of TNT
energy
can
100
103
IMT
7
kg
one
ooo
1 MT
yrs
from nuclear
tests
1015 J
4
540 MT
t conventional
war explosives
all solar energy received
by Earth in one minute
62,500 MT
black hole merger
7 MT
Phase
54
Pmankind
Psdar
130
in
TWO
yrs
MT
MT
10
in
o
w
7
108 w
4
1018 W
century
in
b2
MT
minute
demo
bowling ball
Download