For Each Pair of Terms, Explain How the Meanings of the Terms Differ

Name______Class______Date______

Work and Power USING KEY TERMS For each pair of terms, explain how the meanings of the terms differ. 1.work and joule ______2. power and watt ______

UNDERSTANDING KEY IDEAS ______3. How is work calculated? a. force times distance b. force divided by distance c. power times distance d. power divided by distance 4. What is the difference between work and power? ______

MATH SKILLS 5. Using a force of 10 N, you push a shopping cart 10 m. How much work did you do? Show your work below.

6. If you did 100 J of work in 5 s, what was your power output? Show your work below.

7. Analyzing Processes Work is done on a ball when a pitcher throws it. Is the pitcher still doing work on the ball as it flies through the air? Explain. ______Name______Class______Date______8. Applying Concepts You lift a chair that weighs 50 N to a height of 0.5 m and carry it 10 m across the room. How much work do you do on the chair? ______9. What idea about work and force does the following diagram describe? Explain your answer.

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___ 10.Work is being done when a. you apply a force to an object. b. an object is moving after you applied a force to it. c. you exert a force that moves an object in the direction of the force. d. you do something that is difficult. ______11. What is the unit for work? a. joule b. joule per second c. newton d. watt

______12. What is power? a. the strength of someone or something b. the force that is used c. the work that is done d. the rate at which work is done ______13. What is the unit for power? a. newton b. kilogram c. watt Name______Class______Date______d. joule

14. You and a friend together apply a force of 1,000 N to a car, which makes the car roll 10 m in 1 min and 40 s. a. How much work did you and your friend do together? Show your work below.

b. What was the power output? Show your work below.

15. Which of the following is the coldest temperature possible? a. 0 K c. 0ºF b. 0ºC d. –273ºF 16. Does temperature depend on the amount of the substance? Explain. ______17. Describe the process of thermal expansion. ______

18. Convert 35ºC to degrees Fahrenheit. Show your work below.

19) For each pair of terms, explain how the meanings of the terms differ. 1. thermal conductor and thermal insulator ______Name______Class______Date______2. convection and radiation ______

20) UNDERSTANDING KEY IDEAS ______3. Two objects at different temperatures are in contact. Which of the following happens to their thermal energy? a. Their thermal energies remain the same. b. Thermal energy passes from the cooler object to the warmer object. c. Thermal energy passes from the warmer object to the cooler object. d. Thermal energy passes back and forth equally between the two objects. 21. What is heat? ______22. The specific heat of lead is 128 J/kg•°C. How much thermal energy is needed to raise the temperature of a 0.015 kg sample of lead by 10ºC? Show your work below.

23. Two objects have the same total thermal energy. They are different sizes. Are they at the same temperature?

24. Convert 34F to degrees Celsius. Show your work below.

25. Convert 0C to kelvins. Show your work below. Name______Class______Date______Q26) . Convert 100 K to degrees Celsius. Show your work below. For each pair of terms, explain how the meanings of the terms differ. 1. temperature and thermal energy ______2. conduction and heat ______3. conductor and insulator ______

27. How does temperature relate to kinetic energy? ______28. What are the differences between conduction, convection, and radiation? ______29. Explain how heat affects matter during a change of state. ______

30. The weather forecast calls for a temperature of 84ºF. What is the corresponding temperature in degrees Celsius? in kelvins? Show your work below.

31.Someone claims that a large bowl of soup has more thermal energy than a small bowl of soup. Is this always true? Explain.