1.20_6thSci_TE 2.4

TE 2.4 Investigating Energy Transfer 
Objective: KWBAT identify what causes the transfer of energy between two things to stop by investigating in the Sim.

Part 1: Warm Up

After learning about how heat energy transfers, Aaron and Leo were asked to explain why freeze ray guns can’t shoot “cold” at people. Read and compare their arguments. Then, answer the questions below.

Aaron's Argument
A freeze ray cannot shoot “cold” because cold can’t be transferred from one thing to another. Only energy can transfer.

Leo's Argument
A freeze ray cannot shoot “cold” because cold is not an object, it is a description of an object whose molecules have a small amount of kinetic energy. In order to make something colder, kinetic energy has to be transferred out of it. Energy always transfers from the warmer thing to the colder thing, so you would have to put an even colder thing next to the person you were shooting so the kinetic energy would transfer out.

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Which argument is more convincing?

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Why is that argument more convincing?

In a recent SIM trial, a student forgot to turn on the “View Kinetic Energy” button when combining Samples A and B. Although we cannot see the color of the molecules kinetic energy was transferred, we have the graph of Sample A below. It shows the temperature change of Sample A over time as molecules transfer energy.

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Analyze:
What does the graph tell you about the temperature of Sample A over time?

Sentence Starter:
This graph tells me...

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Infer:
What can you infer (predict based on evidence) about what the temperature graph of Sample B would look like?

Sentence Starter:
I can infer that the temperature graph of Sample B....

Part 2: Energy Transfer in the SIM

Part 2A: RUN Mode
Open the Simulation.
Add two samples of equal size.
Turn on the “View Kinetic Energy”.
Make Sample A much hotter than Sample B.
Record the starting temperatures of both samples in the table below.

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Add the Starting Temperatures of Sample A and Sample B.

(you do not need to add the Celcius!!)

CFS
Turn on the “View Energy Transfer”
Drag the samples together, watch and wait until the energy stops transferring completely.
Go back to the table and record the final ending temperatures of both samples.
Complete the statements below to correctly reflect your observations.

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Then, add the Final Temperatures of Sample A and Sample B.

(you do not need to add the Celcius!!)

3

Fill in the blanks!

The options are: MORE, LESS, THE SAME. DO NOT include numbers.

Before coming into contact, the molecules of Sample A had _______ kinetic energy than the molecules of Sample B.

Before coming into contact, the molecules of Sample B had _______ kinetic energy than the molecules of Sample A.

Once they stopped transferring, the molecules of Sample A had _______ kinetic energy than molecules of Sample B.

Part 2B: ANALYZE and Thermal Energy
Switch to Analyze mode.
Scroll back the replay to the beginning part right after you made one sample hot and one cold.
Look at the Thermal Energy graph.
Record the thermal energy of the samples at that spot
Scroll forward and record the total thermal energy after it ends.

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Record the thermal energy of the samples at the start.
Then, record the thermal energy of the samples at the end!

1

The thermal energy of Sample A _ and the thermal energy ______ of Sample B after contact.

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Predict: Why did the transfer of energy between the two samples stop?

Part 3: Defining Change, Stability & Equilibrium

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When did you see your system in the SIM become stable?

Sentence Starter:
The system became stable when...

Part 4: Exit Ticket
The four systems below model sets of samples that have not yet come into contact with each other.

1

Which systems would change once their samples come into contact?

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Explain your answer choice(s) for the question above.

1

Are any systems already stable and at equilibrium? Identify which systems are at equilibrium.

(Hint: If the samples came into contact, would they transfer energy to each other? If no, then they are already at equilibrium.)

0

Explain your answer choice(s) for the question above.

Finished early?
Please note that I will start marking your assignments as MISSING if you FORGET TO SUBMIT.
You SHOULD NOT be playing any of these if you did not complete your Key Takeaway tracker document. Your computer will be locked.
Try these:
Legends of Learning Set 1
Legends of Learning Set 2
EXTRA PRACTICE FOR THIS UNIT

1.20_6thSci_TE 2.4

Part 1: Warm Up

Which argument is more convincing?

Why is that argument more convincing?

Analyze:What does the graph tell you about the temperature of Sample A over time?Sentence Starter:This graph tells me...

Infer:What can you infer (predict based on evidence) about what the temperature graph of Sample B would look like?Sentence Starter:I can infer that the temperature graph of Sample B....

Part 2: Energy Transfer in the SIM

Add the Starting Temperatures of Sample A and Sample B.(you do not need to add the Celcius!!)

CFS

Then, add the Final Temperatures of Sample A and Sample B.(you do not need to add the Celcius!!)

Part 2B: ANALYZE and Thermal Energy

Record the thermal energy of the samples at the start.Then, record the thermal energy of the samples at the end!

The thermal energy of Sample A _________ and the thermal energy ______________ of Sample B after contact.

Predict: Why did the transfer of energy between the two samples stop?

Part 3: Defining Change, Stability & Equilibrium

When did you see your system in the SIM become stable?Sentence Starter:The system became stable when...

Part 4: Exit Ticket

Which systems would change once their samples come into contact?

Explain your answer choice(s) for the question above.

Are any systems already stable and at equilibrium? Identify which systems are at equilibrium.(Hint: If the samples came into contact, would they transfer energy to each other? If no, then they are already at equilibrium.)

Explain your answer choice(s) for the question above.

Part 1: Warm Up

Which argument is more convincing?

Why is that argument more convincing?

Analyze:What does the graph tell you about the temperature of Sample A over time?Sentence Starter:This graph tells me...

Infer:What can you infer (predict based on evidence) about what the temperature graph of Sample B would look like?Sentence Starter:I can infer that the temperature graph of Sample B....

Part 2: Energy Transfer in the SIM

Add the Starting Temperatures of Sample A and Sample B.(you do not need to add the Celcius!!)

CFS

Then, add the Final Temperatures of Sample A and Sample B.(you do not need to add the Celcius!!)

Part 2B: ANALYZE and Thermal Energy

Record the thermal energy of the samples at the start.Then, record the thermal energy of the samples at the end!

The thermal energy of Sample A _________ and the thermal energy ______________ of Sample B after contact.

Predict: Why did the transfer of energy between the two samples stop?

Part 3: Defining Change, Stability & Equilibrium

When did you see your system in the SIM become stable?Sentence Starter:The system became stable when...

Part 4: Exit Ticket

Which systems would change once their samples come into contact?

Explain your answer choice(s) for the question above.

Are any systems already stable and at equilibrium? Identify which systems are at equilibrium.(Hint: If the samples came into contact, would they transfer energy to each other? If no, then they are already at equilibrium.)

Explain your answer choice(s) for the question above.

Analyze:
What does the graph tell you about the temperature of Sample A over time?

Sentence Starter:
This graph tells me...

Infer:
What can you infer (predict based on evidence) about what the temperature graph of Sample B would look like?

Sentence Starter:
I can infer that the temperature graph of Sample B....

Add the Starting Temperatures of Sample A and Sample B.

(you do not need to add the Celcius!!)

Then, add the Final Temperatures of Sample A and Sample B.

(you do not need to add the Celcius!!)

Record the thermal energy of the samples at the start.
Then, record the thermal energy of the samples at the end!

The thermal energy of Sample A _ and the thermal energy ______ of Sample B after contact.

When did you see your system in the SIM become stable?

Sentence Starter:
The system became stable when...

Are any systems already stable and at equilibrium? Identify which systems are at equilibrium.

(Hint: If the samples came into contact, would they transfer energy to each other? If no, then they are already at equilibrium.)

Analyze:
What does the graph tell you about the temperature of Sample A over time?

Sentence Starter:
This graph tells me...

Infer:
What can you infer (predict based on evidence) about what the temperature graph of Sample B would look like?

Sentence Starter:
I can infer that the temperature graph of Sample B....

Add the Starting Temperatures of Sample A and Sample B.

(you do not need to add the Celcius!!)

Then, add the Final Temperatures of Sample A and Sample B.

(you do not need to add the Celcius!!)

Record the thermal energy of the samples at the start.
Then, record the thermal energy of the samples at the end!

The thermal energy of Sample A _ and the thermal energy ______ of Sample B after contact.

When did you see your system in the SIM become stable?

Sentence Starter:
The system became stable when...

Are any systems already stable and at equilibrium? Identify which systems are at equilibrium.

(Hint: If the samples came into contact, would they transfer energy to each other? If no, then they are already at equilibrium.)