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: electrical energy
2: kinetic energy
3: motion, energy
4: potential energy
4: potential energy
As the pendulum swings freely, what is happening to its energy? (1 point)
1:KE converts to PE as it falls, and then PE converts to KE as it rises
2:PE converts to KE as it falls, and then KE converts to PE as it rises
3:PE converts to KE, and then total energy becomes zero
4:KE converts to PE, and then total energy becomes zero
2:PE converts to KE as it falls, and then KE converts to PE as it rises
When are kinetic energy and potential energy equal in magnitude (equal in amount)?
1:They are equal at the bottom position
2:They are equal at the top position.
3:They are equal half-way between the top position and the bottom position
4:They are equal at every position.
1: They are equal at the bottom position.
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.
How did mass affect the ability of each ball to move the cup?
1:The ball with the higher mass moved the cup a greater distance.
2:The balls moved the cup the same distance.
3:The cup's motion was independent of the mass of the ball.
4:The ball with the lower mass moved the cup a greater distance.
1: The ball with the higher mass moved the cup a greater distance.
How did the mass of the ball impact the ball's kinetic energy?
1:An increase in mass caused a decrease in kinetic energy
2:Mass did not impact kinetic energy
3:A decrease in mass caused an increase in kinetic energy.
4:An increase in mass caused an increase in kinetic energy
4: An increase in mass caused an increase in kinetic energy
What happened to the kinetic energy of the ball when it hit the cup?
1:Overall, kinetic energy was gained.
2:Overall, kinetic energy was lost.
3:Some of the energy was transferred to the cup.
4:All of the kinetic energy was kept by the ball.
3: Some of the energy was transferred to the cup.
The image shows an apple falling from a window ledge 6 meters off the ground.
6
4
2
0
At Which position is the potential energy the greatest?
1:6 m
2:4 m
3:2 m
4:0 m
At Which position is the kinetic energy the greatest
1:6 m
2:just below 6 m
3: just above 0 m
4:0 m
What is happening to potential energy has the ball is falling
1:Potential energy is decreasing
2:Potential energy is increasing
3:Potential energy is staying the same
4:It is impossible to tail
What is happening to kinetic energy as the ball is falling
1:Kinetic energy is decreasing
2:Kinetic energy is increasing
3:Kinetic energy is staying the same
4:It is impossible to tail
What is happening to total energy has the ball is falling
1:Total energy is decreasing
2:Total energy is increasing
3:Total energy is staying the same
4:It is impossible to tell
At which position is the potential energy the greatest?
1. 6 m
At which position is the kinetic energy the greatest?
4. 0 m
What is happening to potential energy as the ball is falling?
1. Potential energy is decreasing
What is happening to kinetic energy as the ball is falling?
2. Kinetic energy is increasing
What is happening to total energy as the ball is falling?
3. Total energy is staying the same
Are you sure?
Apologies for the confusion. Here are the correct answers:
At which position is the potential energy the greatest?
1. 6 m
At which position is the kinetic energy the greatest?
4. 0 m
What is happening to potential energy as the ball is falling?
1. Potential energy is decreasing
What is happening to kinetic energy as the ball is falling?
2. Kinetic energy is increasing
What is happening to total energy as the ball is falling?
3. Total energy is staying the same
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 for their conversation
A. Sharon reminded Bruce that the basketball had energy as it fell. This energy of motion is called fill (in the blank)Bruce agreed and said this energy of motion was (fill in the blank) 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 sorted energy is called, (fill in the blank) Sharon explain that this stored energy (fill in the blank) as the ball fell
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 the greatest 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 is converted to kinetic energy as the ball fell.
Are your sure?
Apologies for the confusion. Here are the correct answers:
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 greatest 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 is converted to kinetic energy as the ball fell.
Sharon and Bruce want to determine what type of energy the basketball has at various times.
Identifying the type of types of energy described in each situation listed below
The basketball is sitting on the wall. (is there a potential energy or kinetic energy)
The basketball is falling in is about halfway between the top in the bottom (is the potential energy or kinetic energy)
After the basketball hits the ground, it starts rolling across the ground in front of the wall (is that potential energy or kinetic energy)
The basketball is sitting on the wall.
- It has potential energy.
The basketball is falling and is about halfway between the top and the bottom.
- It has a combination of potential energy and kinetic energy. The potential energy is decreasing as it falls, and the kinetic energy is increasing.
After the basketball hits the ground, it starts rolling across the ground in front of the wall.
- It has 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?
Ms. Smith throws a piece of trash into the trashcan. (this does show energy transfer return object or this does not show and energy transfer to an object)
Ms. Smith picks up a book drops it and allows it to hit the floor.(this does show energy transfer return object or this does not show and 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 energy transfer return object or this does not show and energy transfer to an object)
Ms. Smith waits patiently while her students settle into their seats (this does show energy transfer return object or this does not show and energy transfer to an object)
Among the given activities of Ms. Smith, the ones that show energy transfer are:
Ms. Smith throws a piece of trash into the trashcan.
- This shows energy transfer as the energy from Ms. Smith's hand is transferred to the piece of trash.
Ms. Smith picks up a book, drops it, and allows it to hit the floor.
- This shows energy transfer as the potential energy of the book is transferred to kinetic energy as it falls and hits the floor.
Ms. Smith pushes her markers out of the way so she can put her papers on the table.
- This does not show energy transfer to an object. Ms. Smith's action involves applying force, but there is no transfer of energy to the markers.
Ms. Smith waits patiently while her students settle into their seats.
- This does not involve energy transfer to an object. It is a passive situation where no energy is being transferred to or from any object.
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.
In which section or sections is the bike's kinetic energy increasing?
You might need to choose more than one answer.
1:section A
2:section B
3:section C
4:section D
5:section E
6:section F
In which section does the bike have the highest constant kinetic energy?
1:section A
2:section B
3:section C
4:section D
5:section E
6:section F
Describe the bike's motion in section E.
1:The bike is getting slower.
2;The bike is getting faster.
3:The bike is moving at a constant speed.
4:The bike is not moving.
What is similar about section E and section F?
1:The kinetic energy is increasing.
2:The kinetic energy is decreasing.
3:The kinetic energy is staying the same.
4:The kinetic energy goes down and then up.
Throughout the bike ride, what causes the bike to move?
1:Tamara transfers energy to the bike by moving the pedals.
2:The bike pulls energy out of the ground.
3:The Earth's gravitational pull makes it move.
4:The bike is swinging from a pendulum.
In which section is it most likely that Tamara stopped pedaling and allowed the bike to coast to a stop?
1:section A
2:section B
3:section C
4:section D
5:section E
6:suction F
In which section or sections is the bike's kinetic energy increasing?
1: section A
In which section does the bike have the highest constant kinetic energy?
3: section C
Describe the bike's motion in section E.
3: The bike is moving at a constant speed.
What is similar about section E and section F?
2: The kinetic energy is decreasing.
Throughout the bike ride, what causes the bike to move?
1: Tamara transfers energy to the bike by moving the pedals.
In which section is it most likely that Tamara stopped pedaling and allowed the bike to coast to a stop?
6: section F