Name
Date
Lesson Outline
Energy Transformations
Class
LESSON 2
1. Energy can ______________ forms.
The Law of Conservation of Energy: _____________________________________________________
_____________________________________________________________________________________
_____________________________________________________________________________________
a. Example 1: Changes between KE and PE: Throwing a
basketball
i. When the player is holding the ball, the KE of the ball
is ______________. It does have ______________
because if its ______________ above the ground.
ii. As the ball is thrown ______________, it has a lot of
______________.
iii. As the ball moves upward, ______________ pulls it
and its speed and KE ______________, but the PE
(gravitational PE) is ______________ because the
ball’s ______________ is increasing.
iv. At the ball’s highest point, the GPE is
______________, and the ball’s kinetic energy is the
______________.
v. As the ball moves downward, PE ______________. At
the same time, the ball’s kinetic energy
______________.
vi. When the ball reaches the player’s hand again, its KE is
at the ______________ value again.
vii. When it stops in the player’s hand, KE is
______________, while PE is ______________.
b. Example 2: Changes between KE and PE: A pendulum
i. When the ball is at rest, it has some PE because it is ___________________ off the ground.
ii.
When the ball is pulled back, what is its KE and PE?
________________________________________________________________
iii.
When the ball is released, what happens to the energy of the ball?
_________________________________________________________________
iv.
When the ball is swinging and has reached the mid point, what happens to
the energy of the ball?
_______________________________________________________________
_______________________________________________________________
v.
When the ball is swinging and has reached the highest point on the other
side, what is the balls energy?
_______________________________________________________________
_______________________________________________________________
c. Example 3: A roller coaster
i. Describe the energy at point A.
_________________________________
_________________________________
ii. Describe the energy at point B.
__________________________________
__________________________________
iii. Describe the energy at point C.
__________________________________
__________________________________
iv. Describe the energy at point D.
__________________________________
_________________________________
v. Could the cars ever have enough energy to
reach another point as high as point a?
___________________________________
___________________________________
___________________________________
___________________________________
___________________________________
vi. If energy cannot be destroyed, what causes the cars to slow down?
_________________________________________________________________________
_________________________________________________________________________
2. Energy can be lost when it is converted into thermal energy.
a. Friction is a force that ______________ the ______________ of two surfaces that are touching.
b. A moving bicycle has___________________energy. When you apply the brakes, the bicycle’s
mechanical energy is not ___________________.
c. The mechanical energy is transformed into ___________________ energy. ______________
between the brake pad of a car and the moving wheel transforms mechanical energy into
______________ energy (heat). The car ____________________________.
d. There is always ______________ between any two surfaces that are rubbing against each other.
e. EX: Rubbing hands.
f. When you use ______________, you usually change it from one form into another.
g. All forms of energy can be transformed into ______________energy.
h. When energy changes form, some ______________ energy is always ___________________.
i. Scientists often refer to thermal energy that cannot be used as ____________________________.
j. Whenever energy is used, some energy is transformed into ______________ energy and some is
transformed into ______________ energy.
3. Using Thermal Energy:
a. All forms of energy can be transformed into ______________ energy.
b. a gas stove transforms the ____________________ energy in gas to thermal energy.
c. An electric heater transforms ____________________ into heat
d. A jet engine ______________ fuel, releasing thermal energy from ______________ energy, and
then transfers the thermal energy into ____________________ energy.
4. Using Chemical Energy:
a. Plants convert ______________ energy (______________) into ______________ energy that is
stored in the chemical bonds of ______________molecules.
b. When animals eat ______________, they release the______________energy from the food and
transform it into ____________________ energy and ______________ energy (body heat).
5. Using Radiant Energy:
a. ____________________________transform radiant energy into ____________________ energy.
b. Talking on your cell phone: Cell phones receive ______________energy (microwaves that are sent
from the cell phone tower to your phone) and transforms it into ___________________ energy to
power the _________________. The speaker transforms the ________________ energy into
______________energy.
6. Waste Energy
a. Energy transformation is not _____________________.
b. Whenever energy is transformed, some is ______________ to the surroundings as
______________energy.
i. __________________________________________________
ii. __________________________________________________
iii. __________________________________________________
c. When energy is lost during transformation, it is called waste energy. It does NOT
____________________________, but transforms into a type of energy not being
______________.