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Question 1 of 6

1. Question
How does the field of physics define “work”?
- Work is the research done by physicists in a laboratory.
- Work is the change in speed of a falling object.
- Work is the amount of energy in the solar system.
- Work is the ability to move an object
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Question 2 of 6

2. Question
Listen again to part of the lecture. Then answer the question. Why does the professor talk about a plow?
- To describe recent improvements in agricultural technology.
- To explain what happens when a moving object meets resistance
- To show how a plow is the least efficient piece of farm equipment.
- To give reasons for the failure of agriculture in some areas.
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Question 3 of 6

3. Question
Based on the information in the lecture, indicate whether each statement below reflects the first law of thermodynamics. Click the correct choice(s) to indicate “YES! This reflects the first law…”
- Electricity can be converted to heat or light.
- The amount of energy in any system stays the same.
- Nuclear energy is regulated by international law.
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Question 4 of 6

4. Question
Which two sentences illustrate the conversion of energy from one form to another?Click on two answers.
- A car changes the chemical energy in gasoline to motion
- A tractor engine stops when the fuel tank is empty.
- An electric stove converts electricity to heat energy.
- A light bulb burns out after being on for 100 hours
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Question 5 of 6

5. Question
Listen again to part of the lecture. Then answer the question.Why does the professor say this: (listen!)
- To support the idea of giving food aid to needy people
- To explain why organisms must create their own energy.
- To recommend the development of new energy sources.
- To show that both machines and living things need energy
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Question 6 of 6

6. Question
What can be inferred about the energy in the earth as a whole system?
- The system gradually gains energy in the form of heat.
- If there is no sunlight, the earth makes its own energy.
- No new energy is created, and no energy is destroyed.
- Plants contribute more energy than animals contribute.
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