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## Thermal Energy

1.
The thermal energy of an object is the sum of the                      and                      energy of all the molecules in an object.
1. heat, temperature
2. thermal, mechanical
3. friction, convection
4. kinetic, potential
2.
Thermal energy always moves:
1. from a higher temperature to a lower temperature
2. from a lower temperature to a higher temperature
3. from inside to outside
4. thermal energy does not move
3.
Thermal energy can be transferred by
1. conduction only
2. convection only
4.
Which of the following most accurately describes how an insulated lunch bag keeps your food cool?
1. The material prevents the cool air from leaving the bag.
2. The material destroys thermal energy.
3. The material prevents thermal energy outside from flowing into the bag.
4. The material produces cold molecules.
5.
Which has the most thermal energy?
1. 1 cup of cold water
2. 1 gallon of cold water
3. 1 cup of hot water
4. 1 gallon of hot water
6.
A pan of water is set on a stove. After the heat is turned on, the temperature of the water begins to                     and the thermal energy of the water                    .
1. decrease, decreases
2. decrease, increases
3. increase, increases
4. increase, decreases
7.
Sample 1 has 500 grams of sodium at a temperature of 25 degrees Celsius. Sample 2 has 100 grams of sodium at a temperature of 25 degrees Celsius. What is true about the thermal energy of the two samples?
1. Sample 1 has more thermal energy
2. Sample 2 has more thermal energy
3. Samples 1 and 2 have equal amounts of thermal energy
4. None of the above
8.
Which of the following best explains the scenario below?

On a summer morning, John walks barefoot across his paved driveway with no problem. However, later that afternoon he steps barefoot onto the same driveway and must quickly run off because the bottoms of his feet feel like they are burning.
1. As the temperature increased during the day, the particles in the pavement moved slower and the thermal energy increased.
2. As the temperature increased during the day, the particles in the pavement moved slower and the thermal energy decreased.
3. As the temperature increased during the day, the particles in the pavement moved faster and the thermal energy increased.
4. As the temperature increased during the day, the particles in the pavement moved faster and the thermal energy decreased.
9.
How is temperature different from thermal energy?

10.
Explain how the mass of an object is considered when measuring thermal energy but not necessarily its temperature.

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