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# Massachusetts Comprehensive Assessment System

## 2015, High School Intro Physics

 Question 44: Open-Response Reporting Category: Heat and Heat TransferStandard: 3.1 - Explain how heat energy is transferred by convection, conduction, and radiation. A student was investigating cooling times for two pots made of different materials. One pot was stainless steel and the other pot was iron. The pots were placed on a table in a 25°C room. The pots were roughly the same size and shape, and contained the same amount of water. The pots and water were originally at 100°C. The student recorded the temperature of the water in each pot over time. The graph below shows the results.Determine the amount of time it took the water in the iron pot to cool from 100°C to 60°C.Based on the graph, which pot, the iron pot or the stainless steel pot, was a better conductor of thermal energy? Explain your answer.Identify two methods of heat transfer that occurred as the water in the pots cooled, and describe how the transfer of heat occurred for each method.Describe when the pots no longer experienced a net loss of thermal energy.

### Scoring Guide and Sample Student WorkSelect a score point in the table below to view the sample student response.

ScoreDescription
4 The response demonstrates a thorough understanding of heat transfer by convection, conduction, and radiation and of thermal equilibrium. The response correctly determines the time it took for water in the iron pot to cool to 60°C, and clearly explains which pot is a better conductor. The response also correctly identifies and clearly describes two methods of heat transfer that occurred as the water cooled, and describes when the pots no longer experienced a net loss of thermal energy.
4
3 The response demonstrates a general understanding of heat transfer by convection, conduction, and radiation and of thermal equilibrium.
2 The response demonstrates a limited understanding of heat transfer by convection, conduction, and radiation and of thermal equilibrium.
1 The response demonstrates a minimal understanding of heat transfer by convection, conduction, and radiation and of thermal equilibrium.
0 The response is incorrect or contains some correct work that is irrelevant to the skill or concept being measured.

Note: There are 2 sample student responses for Score Point 4.

Question 12:
Question 23:
Question 32:
Question 44:
Question 45: