Potential and Kinetic Energy

Question 1

✔ increasesdecreasesstays the same

Revolt · Accepted Answer

A: increases

Question 2

Question 2

Revolt · Accepted Answer

D

Question 3

The diagram shows molecules in a fluid. Explain the sequence of events that happens when this fluid cools down. Be sure to focus on what happens to the molecules and to the fluid in general. Five events should be included in your answer.

Revolt · Accepted Answer

As the fluid cools down, the following sequence of events occurs: 
1. The thermal energy of the fluid decreases.
2. The molecules lose kinetic energy and begin to move more slowly.
3. As the molecules slow down, the attractive forces between them pull them closer together.
4. Because the molecules are closer together, the fluid's volume decreases and its density increases (thermal contraction).
5. Eventually, the movement slows enough that the fluid may undergo a phase change, such as freezing into a solid.

Question 4

What happens at night?

Revolt · Accepted Answer

B: Cool air over the land moves offshore.

Question 5

How is thermal energy transferred during convection?

Revolt · Accepted Answer

C: by movement in fluids

Question 6

Which statements best describe convection? Check all that apply.Convection occurs in solids.Convection occurs in liquids and gases.Convection transfers thermal energy.Convection transfers potential energy.Convection occurs until all of the fluid is at the same temperature.Convection occurs only one time, no matter the temperature.

Revolt · Accepted Answer

B: Convection occurs in liquids and gases.; C: Convection transfers thermal energy.; E: Convection occurs until all of the fluid is at the same temperature.

Question 7

Question 7

Revolt · Accepted Answer

A,B,C,D,E

Question 8

In a lava lamp, a waxy substance rises and falls repeatedly. What causes the waxy substance to rise? Check all that apply.

Revolt · Accepted Answer

B: The waxy substance is warm.; C: The waxy substance is less dense than the surrounding liquid.; E: Convection is occurring.

Question 9

Question 9

Revolt · Accepted Answer

Three situations in which convection occurs include a pot of boiling water, air circulation in the atmosphere, and the movement of molten material in Earth's interior.

Question 10

Use the drop-down menus to identify each labeled part of the diagram. Label A: Label B: Label C:

Revolt · Accepted Answer

D: Cool fluid sinks

Potential and Kinetic Energy Answers

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