Date
Name
Class
Lesson Outline
En e
rgy
LESSON 2
Tra n sfo r m at¡ o n s
A. Changes Between Forms of Energy
1. A microwave oven changes electrical energy to
ffu¡¡¡17
nergy.
2. The changes from electrical energy to radiant energy to thermal energy are called
7ø-¡¡s,ueù/tAzto*lg
energy
B. Changes Between Kinetic and Potential Energy
1. When you throw
a
ball upward, the ball has its greatest speed and the most
Et.Ng(2.
As the ball reaches its highest
P,er¿
3.
energy when
As the
^lv7j*L
leaves your hand.
point, the ball gains its greatest
energy,
VarxatTlkL
ball moves downward,
l4Nertc
it first
energy decreases and
energy rncreases.
C. The Law of Conservation of Energy
n
energy can be transformed from one
1. According to the
form into another or transferred from one region to another, but energy cannot be
created or destroyed.
.!
È
Et c-rto*l
2.
another
fz¡-rro¿
E
O
;
is a force that resists the sliding of one surface over
(,
b.
As
you pedal a bicycle, you do
F
,
(,
a
.E
c
c
U
21/eeL
and transfer
to the bicvcle.
c
E
between any surfaces that are
a. There is aÌways some
in contact with each other
c.
Because
of
F4¿¿:noN
between moving parts of a bicycle, some
of the work you do changes to
4u,+L 30u
/¿¡6p¡¿p¡Jf
d. One way to reduce friction is to apply a(n)
surfaces that rub against each other
e. When you apply brakes on a bicycle, the bicycle's
energy is not destroyed; instead, the bicycle's
into thermal energy. The
¡emains
the same.
energy
is transformed
Energy and Energy Transformations
útsnc
-7orz¿
to
At&
èz-¿;
energy
amount of
29
Name
Date
Class
Content Practice A
En e
rgy
Tra n sfo rm
LESSON 2
ation s
Directions:
On eøch line, wríte the term ftom the word bank that conectly completes each sentence. Some terms
møy be used more thøt once.
transformation friction
potential
radiant
electrical
energy
law of conservation of energy
1
According to
kinetic
thermal
energy cannot be created or destroyed.
2. A change from electrical energy to radiant energy to thermal energy is called
a(fi âNâr¿raf 74*t'tsøP¡t't4V opl'u
3. A force that resists the sliding of one surface over another
IS
ft¡¿-7¡o¡
4. A microwave oven
changes
-/þ/gE t'l/+L
5.
ã¿e.zr* rc,ota
energy to radiant energy to
energy
Suppose you are shooting a basketball toward a hoop. As the ball rises
FaretJTttM-.
in the air, its
ô
a
OrJat¿
energy increases and its
:.
decreases.
o
ã-
6.
As the ball falls back toward the floor, its
and its
?af¿zlTlll-t-
c
LtNarrc-
energy rncreases
¡€
decreases.
=
7. Friction transforms
-<.
some mechanical energy into
8. You use a lamp to change
fut*NT
Ë¿r-qetc,A-L
-¡p¡¿ptwrAL
energy.
energy into
z.
a
cf,
a
enerS.y
==
a)
9. When you use a battery, you transform chemical energy stored in the battery to
E¿¿zZEICAL
enerSy.
10. The exhaust from a car contains fl/äz-M,fu
energy that cannot be
used. Scientists often refer to this energy that cannot be used as waste energy.
32
Energy and Energy Transformations
!
ã'
-