A pendulum is held at the top of its swing. The person holding the pendulum lets go, and the pendulum is allowed to swing freely. Answer the following questions about the pendulum.
a. When the pendulum is held at the top of its swing, what type of energy does it have?
(1 point)
Responses
electrical energy
electrical energy
motion energy
motion energy
potential energy
potential energy
kinetic energy
kinetic energy
Question 2
b. As the pendulum swings freely, what is happening to its energy?(1 point)
Responses
PE converts to KE as it falls, and then KE converts to PE as it rises
PE converts to KE as it falls, and then KE converts to PE as it rises
KE converts to PE, and then total energy becomes zero
KE converts to PE, and then total energy becomes zero
KE converts to PE as it falls, and then PE converts to KE as it rises
KE converts to PE as it falls, and then PE converts to KE as it rises
PE converts to KE, and then total energy becomes zero
PE converts to KE, and then total energy becomes zero
Question 3
c. When are kinetic energy and potential energy equal in magnitude (equal in amount)?(1 point)
Responses
They are equal at every position.
They are equal at every position.
They are equal at the bottom position.
They are equal at the bottom position.
They are equal half-way between the top position and the bottom position.
They are equal half-way between the top position and the bottom position.
They are equal at the top position.
They are equal at the top position.
what are a b and c
a. The type of energy the pendulum has when held at the top of its swing is potential energy.
b. As the pendulum swings freely, its potential energy converts to kinetic energy as it falls, and then the kinetic energy converts back to potential energy as it rises.
c. Kinetic energy and potential energy are equal in magnitude at the top position of the pendulum's swing.
In one part of this unit's sample work, we tested how mass impacts kinetic energy. First, the teacher allowed one ball to roll freely down a ramp. Then, from the same height on the ramp, she allowed a ball with greater mass to roll freely down the ramp. Each ball was allowed to strike a cup at the bottom of the ramp.
a. How did mass affect the ability of each ball to move the cup?
(1 point)
Responses
The cup's motion was independent of the mass of the ball.
The cup's motion was independent of the mass of the ball.
The ball with the higher mass moved the cup a greater distance.
The ball with the higher mass moved the cup a greater distance.
The ball with the lower mass moved the cup a greater distance.
The ball with the lower mass moved the cup a greater distance.
The balls moved the cup the same distance.
The balls moved the cup the same distance.
Question 2
b. How did the mass of the ball impact the ball's kinetic energy?(1 point)
Responses
An increase in mass caused an increase in kinetic energy.
An increase in mass caused an increase in kinetic energy.
A decrease in mass caused an increase in kinetic energy.
A decrease in mass caused an increase in kinetic energy.
Mass did not impact kinetic energy.
Mass did not impact kinetic energy.
An increase in mass caused a decrease in kinetic energy.
An increase in mass caused a decrease in kinetic energy.
Question 3
c. What happened to the kinetic energy of the ball when it hit the cup?(1 point)
Responses
Some of the energy was transferred to the cup.
Some of the energy was transferred to the cup.
Overall, kinetic energy was lost.
Overall, kinetic energy was lost.
All of the kinetic energy was kept by the ball.
All of the kinetic energy was kept by the ball.
Overall, kinetic energy was gained
a b and c
a. The ball with the higher mass moved the cup a greater distance.
b. An increase in mass caused an increase in kinetic energy.
c. Some of the energy was transferred to the cup.
The image shows an apple falling from a window ledge 6 meters off the ground.
a. At which position is the potential energy the greatest?
(1 point)
Responses
6 m
6 m
4 m
4 m
2 m
2 m
0 m
0 m
Question 2
b. At what position is the kinetic energy the greatest?(1 point)
Responses
6 m
6 m
just below 6 m
just below 6 m
just above 0 m
just above 0 m
0 m
0 m
Question 3
c. What is happening to potential energy as the ball is falling?(1 point)
Responses
Potential energy is decreasing.
Potential energy is decreasing.
Potential energy is increasing.
Potential energy is increasing.
Potential energy is staying the same.
Potential energy is staying the same.
It is impossible to tell.
It is impossible to tell.
Question 4
d. What is happening to kinetic energy as the ball is falling?(1 point)
Responses
Kinetic energy is decreasing.
Kinetic energy is decreasing.
Kinetic energy is increasing.
Kinetic energy is increasing.
Kinetic energy is staying the same.
Kinetic energy is staying the same.
It is impossible to tell.
It is impossible to tell.
Question 5
e. What is happening to total energy as the ball is falling?(1 point)
Responses
Total energy is decreasing.
Total energy is decreasing.
Total energy is increasing.
Total energy is increasing.
Total energy is staying the same.
Total energy is staying the same.
It is impossible to tell.
a. The potential energy is the greatest at a height of 6 m.
b. The kinetic energy is the greatest just above 0 m.
c. The potential energy is decreasing as the ball is falling.
d. The kinetic energy is increasing as the ball is falling.
e. The total energy is staying the same as the ball is falling.
Sharon and Bruce are playing basketball at a local park. When they take a break, they put the basketball on the brick wall that is near the bleachers. They notice that the basketball rolls off the wall and falls to the ground.
This makes them think about a school lesson about energy. Fill in the blanks from their conversation.
(4 points)
a. Sharon reminded Bruce that the basketball had energy as it fell. This energy of motion is called
. Bruce agreed and said this energy of motion was
right before the ball hit the ground.
b. Then Bruce recalled that the ball originally had stored energy as it sat on the wall. This stored energy is called
. Sharon explained that this stored energy
as the ball fell.
Question 2
Sharon and Bruce want to determine what type of energy the basketball has at various times.
c. Identify the type or types of energy described in each situation listed below.
You might click only one answer in each row, or you might click both answers in a row.
(3 points)
potential energy kinetic energy
The basketball is sitting on the wall.
potential energy – The basketball is sitting on the wall.
kinetic energy – The basketball is sitting on the wall.
The basketball is falling and is about half-way between the top and the bottom.
potential energy – The basketball is falling and is about half-way between the top and the bottom.
kinetic energy – The basketball is falling and is about half-way between the top and the bottom.
After the basketball hits the ground, it starts rolling across the ground in front of the wall.
a. Sharon reminded Bruce that the basketball had energy as it fell. This energy of motion is called kinetic energy. Bruce agreed and said this energy of motion was highest right before the ball hit the ground.
b. Then Bruce recalled that the ball originally had stored energy as it sat on the wall. This stored energy is called potential energy. Sharon explained that this stored energy converted to kinetic energy as the ball fell.
c. The basketball is sitting on the wall - potential energy
The basketball is falling and is about halfway between the top and the bottom - both potential energy and kinetic energy
After the basketball hits the ground, it starts rolling across the ground in front of the wall - kinetic energy
Ms. Smith is teaching a lesson about energy. She has her students evaluate her activities as she teaches the lesson.
Which of Ms. Smith's activities show energy transfer?
(4 points)
This DOES show an energy transfer to an object. This does NOT show an energy transfer to an object.
Ms. Smith pushes her markers out of the way so she can put her papers on the table.
This DOES show an energy transfer to an object. – Ms. Smith pushes her markers out of the way so she can put her papers on the table.
This does NOT show an energy transfer to an object. – Ms. Smith pushes her markers out of the way so she can put her papers on the table.
Ms. Smith throws a piece of trash into the trash can.
This DOES show an energy transfer to an object. – Ms. Smith throws a piece of trash into the trash can.
This does NOT show an energy transfer to an object. – Ms. Smith throws a piece of trash into the trash can.
Ms. Smith waits patiently while her students settle into their seats.
This DOES show an energy transfer to an object. – Ms. Smith waits patiently while her students settle into their seats.
This does NOT show an energy transfer to an object. – Ms. Smith waits patiently while her students settle into their seats.
Ms. Smith picks up a book, drops it, and allows it to hit the floor.
This DOES show an energy transfer to an object. - Ms. Smith picks up a book, drops it, and allows it to hit the floor.
all the answers
This DOES show an energy transfer to an object. - Ms. Smith pushes her markers out of the way so she can put her papers on the table.
This DOES show an energy transfer to an object. - Ms. Smith throws a piece of trash into the trash can.
This does NOT show an energy transfer to an object. - Ms. Smith waits patiently while her students settle into their seats.
This DOES show an energy transfer to an object. - Ms. Smith picks up a book, drops it, and allows it to hit the floor.
Tamara rides her bike around her neighborhood.
For the first minute, she speeds up rapidly.
For the next 4 minutes, she goes a constant speed.
For the next 1 minute, she speeds up more.
For the next 2 minutes, she goes a new constant speed.
For the next 2 minutes, she slows down.
For the last 2 minutes, she slows down more and eventually stops.
Think about how the different parts of Tamara's trip relate to kinetic energy.
Study the graph and then answer the questions.
Question 1
a. In which section or sections is the bike's kinetic energy increasing?
You might need to choose more than one answer.
(1 point)
Responses
section A
section A
section B
section B
section C
section C
section D
section D
section E
section E
section F
section F
Question 2
b. In which section does the bike have the highest constant kinetic energy?(1 point)
Responses
section A
section A
section B
section B
section C
section C
section D
section D
section E
section E
section F
section F
Question 3
c. Describe the bike's motion in section E.(1 point)
Responses
The bike is getting slower.
The bike is getting slower.
The bike is getting faster.
The bike is getting faster.
The bike is moving at a constant speed.
The bike is moving at a constant speed.
The bike is not moving.
The bike is not moving.
Question 4
d. What is similar about section E and section F?(1 point)
Responses
The kinetic energy is increasing.
The kinetic energy is increasing.
The kinetic energy is decreasing.
The kinetic energy is decreasing.
The kinetic energy is staying the same.
The kinetic energy is staying the same.
The kinetic energy goes down and then up.
The kinetic energy goes down and then up.
Question 5
e. Throughout the bike ride, what causes the bike to move?(1 point)
Responses
The bike pulls energy out of the ground.
The bike pulls energy out of the ground.
The bike is swinging from a pendulum.
The bike is swinging from a pendulum.
The Earth's gravitational pull makes it move.
The Earth's gravitational pull makes it move.
Tamara transfers energy to the bike by moving the pedals.
Tamara transfers energy to the bike by moving the pedals.
Question 6
f. In which section is it most likely that Tamara stopped pedaling and allowed the bike to coast to a stop?(1 point)
Responses
section A
section A
section B
section B
section C
section C
section D
section D
section E
section E
section F
a. The bike's kinetic energy is increasing in section A and section E.
b. The bike has the highest constant kinetic energy in section B.
c. In section E, the bike is moving at a constant speed.
d. Section E and section F are similar in that the kinetic energy is decreasing.
e. Throughout the bike ride, the bike moves because Tamara transfers energy to the bike by moving the pedals.
f. It is most likely that Tamara stopped pedaling and allowed the bike to coast to a stop in section F.
Tyler and Denise were playing catch. Tyler threw the ball, and Denise caught it.
Position 1 is the location of the ball immediately after Tyler released it. The blue arrow shows the direction of travel. Position 7 is the location of the ball immediately before Denise caught it.
Study the image and answer the questions.
Question 1
a. Compared to the other positions shown in the image, describe the energy of the ball at positions 1 and 7.(1 point)
Responses
Potential energy is at its highest value, while kinetic energy is at its lowest value.
Potential energy is at its highest value, while kinetic energy is at its lowest value.
Kinetic energy and potential energy are both at their lowest values.
Kinetic energy and potential energy are both at their lowest values.
Kinetic energy is at its highest value, while potential energy is at its lowest value.
Kinetic energy is at its highest value, while potential energy is at its lowest value.
Potential energy and kinetic energy are both at their highest values.
Potential energy and kinetic energy are both at their highest values.
Question 2
b. Drag the terms (listed below the paragraph) into the blanks in order to correctly complete the paragraph.
You will use the terms more than one time each.
(2 points)
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
At positions 2 and 3, Response areais decreasing and Response area is increasing.
At positions 5 and 6, Response areais decreasing and Response area is increasing.
Question 3
c. Compared to the other positions shown in the image, describe the energy of the ball at position 4.
(1 point)
Responses
Potential energy and kinetic energy are both at their highest values.
Potential energy and kinetic energy are both at their highest values.
Potential energy is at its highest value, while kinetic energy is at its lowest value.
Potential energy is at its highest value, while kinetic energy is at its lowest value.
Kinetic energy and potential energy are both at their lowest values.
Kinetic energy and potential energy are both at their lowest values.
Kinetic energy is at its highest value, while potential energy is at its lowest value.
Kinetic energy is at its highest value, while potential energy is at its lowest value.
Question 4
d. Describe the speed of the ball at position 4.
(1 point)
Responses
The speed is at its highest value.
The speed is at its highest value.
The speed is at its lowest value.
The speed is at its lowest value.
The speed is zero.
The speed is zero.
Question 5
e. Use the drop down responses to complete the paragraph.
(5 points)
Energy
be created or destroyed by ordinary physical or chemical process.
This concept is called the
Throughout the experiment, the total amount of energy must
.
When potential energy goes down, kinetic energy
.
When potential energy goes up, kinetic energy
.
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a. The energy of the ball at positions 1 and 7 is potential energy is at its highest value, while kinetic energy is at its lowest value.
b. At positions 2 and 3, potential energy is decreasing and kinetic energy is increasing. At positions 5 and 6, potential energy is decreasing and kinetic energy is increasing.
c. The energy of the ball at position 4 is kinetic energy is at its highest value, while potential energy is at its lowest value.
d. The speed of the ball at position 4 is at its highest value.
e. Energy cannot be created or destroyed by ordinary physical or chemical processes. This concept is called the law of conservation of energy. Throughout the experiment, the total amount of energy must remain constant. When potential energy goes down, kinetic energy increases. When potential energy goes up, kinetic energy decreases.