Chapter 4 Lesson 1 and 2 worksheetsx

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Chapter 4 Lesson 1 and 2
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Chapter 4 Lesson I
Question 1
Two books with
different masses
fall off the same
bookshelf. As they
fall which has
more kinetic
energy and why?
• The one with the
greater mass,
because KE=1/2
mv2
Chapter 4 Lesson I
Question 2
How can the
gravitational
potential energy of
an object be
changed?
Chapter 4 Lesson I
Question 2
How can the
gravitational
potential energy of
an object be
changed?
Raise
it
to
a
great
•
height.
•
Energy is stored in the ch3mical
bonds in the food molecules.
•
No, The energy is stored in the
Chapter 4 Lesson I
Question 3
How is energy
stored in food?
is the form of
energy stored in
food different
from the form of
energy stored in
gasoline?
chemical bonds in the octane,
gasoline, molecule
• Kinetic is the energy
Chapter 4 Lesson I
Question 4
Contrast potential
and kinetic energy.
contained in a
moving object by
virtue of its velocity
and mass.
• Potential energy is
the energy given to
an object due to its
height.
Chapter 4 Lesson I
Question 5
Which ball as the
greatest potential
energy?
___________ the
least _________
• Most PE= D
• Least PE= C
Chapter 4 Lesson I
Question 6
A dump truck, a
sports car, and a
bicycle are
traveling at the
same velocity.
Compare their
kinetic energies.
•
Truck>car>bicycle
Chapter 4 Lesson I
7.The only way Ms. Stayner’s 12 year old Honda can go
more than 52 mph is to roll down a mountain. If the
Honda has a mass of 1300 kg and its velocity is 45
m/s, what is its kinetic energy?
Given
Work
Answer
M= 1300 kg
V=45 m/s
KE= ½ mv2
1,316,250 J
KE= ½ (1300)
(45)(45)
Chapter 4 Lesson I
8.Your physical science textbook is dusty and on a shelf
3 m from the floor. It is sad that you don’t spend
quality time with it. If its mass is 1.25 kg, what is its
gravitational potential energy? Would the GPE be
more or less if the same book were on a shelf 4 m
from the ground?
Given
Work
Answer
M= 1.25 kg
G= 9.8 m/s/s
H= 4 m
PE= mgh
49 J
PE= (1.25) 9.8(4)
• The mechanical energy of
Chapter 4 Lesson 2
Question 1
Explain mechanical
energy and
describe the
mechanical energy
of a roller coaster
car immediately
before it begins
traveling down a
long track.
any object is the sum of
the potential energy and
the kinetic energy. At the
top of the long track the
car has mostly potential
energy, which will change
to kinetic energy as the car
goes down the hill.
Chapter 4 Lesson 2
Question 2
What is the law of
conservation of
energy?
• Energy is neither
created or
destroyed during
a change. It
remains constant.
Chapter 4 Lesson I
Question 3
Applying bicycle
brakes as you ride
down a long hill
causes the brake
pads and wheel
rims to feel warm.
Explain.
• Friction causes
the brake pads to
heat up.
• In the sun and in the center
Chapter 4 Lesson I
Question 4
Where do nuclear
fusion and fission
reactions occur
naturally?
of the earth. That’s why
there is molten rock in the
earth’s core.
Chapter 4 Lesson I
Question 5
How is mass
converted into
energy in nuclear
fission? 5
• Some of the mass
in the nucleus is
changed to energy.
A small amount of
mass can create a
great amount of
energy. This is
done according to
Einstein’s equation,
2
E=mc
Chapter 4 Lesson I
• 6. Riley runs the bases with a blazing velocity of 1 .3
m/s with a massive mass of 18 kg. What is his kinetic
energy?
Given
Work
Answer
M= 18 kg
V= 1.3 m/s
KE= ½ mv2
15 J
KE= ½ (18)
(1.3)(1.3)
Chapter 4 Lesson I
7Your mom wants you to clean your room which
includes doing your yearly dusting. I know it has
been since last year that you looked on top of your
bookcase. As you climb the 4.25 m to get a look at
the top you find the Mt. Dew that you hid from your
little brother. The soda, can, and growth of mold
combine
kg. What is itsAnswer
GPE?
Given to .78 Work
M= 0.78 kg PE= mgh
G= 9.8 m/s/s PE= (.78)
H= 4.25 m
9.8(4.25)
32 J
Chapter 4 Lesson I
Question 2
Chapter 4 Lesson I
Question 2
Chapter 4 Lesson I
Question 2
Chapter 4 Lesson I
Question 2
Chapter 4 Lesson I
Question 2
Chapter 4 Lesson I
Question 2
Chapter 4 Lesson I
Question 1
Two books with
different masses
fall off the same
bookshelf. As they
fall which has
more kinetic
energy and why?
• The one with the
greater mass,
because KE=1/2
mv2
Chapter 4 Lesson I
Question 1
Two books with
different masses
fall off the same
bookshelf. As they
fall which has
more kinetic
energy and why?
• The one with the
greater mass,
because KE=1/2
mv2
Chapter 4 Lesson I
Question 1
Two books with
different masses
fall off the same
bookshelf. As they
fall which has
more kinetic
energy and why?
• The one with the
greater mass,
because KE=1/2
mv2
Chapter 4 Lesson I
Question 1
Two books with
different masses
fall off the same
bookshelf. As they
fall which has
more kinetic
energy and why?
• The one with the
greater mass,
because KE=1/2
mv2
Chapter 4 Lesson I
Question 1
Two books with
different masses
fall off the same
bookshelf. As they
fall which has
more kinetic
energy and why?
• The one with the
greater mass,
because KE=1/2
mv2
Chapter 4 Lesson I
Question 1
Two books with
different masses
fall off the same
bookshelf. As they
fall which has
more kinetic
energy and why?
• The one with the
greater mass,
because KE=1/2
mv2
Chapter 4 Lesson I
Question 1
Two books with
different masses
fall off the same
bookshelf. As they
fall which has
more kinetic
energy and why?
• The one with the
greater mass,
because KE=1/2
mv2

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