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Work, Power and Energy Review

Work, Power and Energy Review. Each table will work as a team to earn points by answering questions. There will be 60 seconds to answer each question from the time I am done reading unless otherwise noted. Answers will be recorded and presented on the whiteboards at each team table.

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Work, Power and Energy Review

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  1. Work, Power and Energy Review • Each table will work as a team to earn points by answering questions. • There will be 60 seconds to answer each question from the time I am done reading unless otherwise noted. • Answers will be recorded and presented on the whiteboards at each team table. • Correct answers will earn the points denoted by the question. Incorrect answers will not be penalized. • The choice of category and question will rotate among teams. • At Final Jeopardy, each time may wager all of their earned points, or $1000, whichever is greater. • The winning team will earn 1 point of extra credit each on tomorrow’s test.

  2. Strategy • Work together with your team. • Talk quietly but discuss possible options. Make sure to write down your solution before time runs out. • After each question and answer we will have time to discuss and answer questions.

  3. Work, Power and Energy Energy Conservation of Energy Work Power Potpourri Q $100 Q $100 Q $100 Q $100 Q $100 Q $200 Q $200 Q $200 Q $200 Q $200 Q $300 Q $300 Q $300 Q $300 Q $300 Q $400 Q $400 Q $400 Q $400 Q $400 Q $500 Q $500 Q $500 Q $500 Q $500 Final Jeopardy: Units

  4. $100 Question from Energy • ___________ is the energy of an object in motion

  5. $100 Answer from Energy • Kinetic energy

  6. $200 Question from Energy • Pulling back a rubber band is a form of storing __________ energy

  7. $200 Answer from Energy • Potential

  8. $300 Question from Energy • Energy is a measure of an object’s _________________

  9. $300 Answer from Energy • Ability to cause change

  10. $400 Question from Energy • What is the kinetic energy of a 15.00 kg boulder resting at the top of a 12.00 m cliff?

  11. $400 Answer from Energy • 0 J (Not moving = no kinetic energy)

  12. $500 Question from Energy • What is the potential energy of a 15.00 kg boulder resting at the top of a 12.00 m cliff?

  13. $500 Answer from Energy • 1764 J

  14. $100 Question from Conservation of Energy • When a ball is thrown directly upward, which of the following is true? • Its kinetic energy is mostly converted to potential energy. • Its potential energy is mostly converted to kinetic energy. • Its kinetic energy is mostly converted to heat.

  15. $100 Answer from Conservation of Energy • A. Its kinetic energy is mostly converted to potential energy.

  16. $200 Question from Conservation of Energy • If energy can be neither created nor destroyed, what do we mean when we say “Don’t waste energy!”

  17. $200 Answer from Conservation of Energy • Don’t convert energy into less useful forms, like heat.

  18. $300 Question from Conservation of Energy • When a car rolls down a hill, most of its potential energy converts to kinetic energy. Where does most of the rest of it go?

  19. $300 Answer from Conservation of Energy • Heat (from friction)

  20. $400 Question from Conservation of Energy • A 2 kg object sits at the top of a 10 m hill. How fast will it be rolling at the bottom of the hill?

  21. $400 Answer from Conservation of Energy • 14 m/s

  22. $500 Question from Conservation of Energy • An object starting with 20 J of potential energy rolls down a hill. At the bottom, 7/8 of the potential energy has been converted to kinetic energy. How much energy (in Joules) was “lost” due to friction?

  23. $500 Answer from Conservation of Energy • 2.5 J

  24. $100 Question from Work • Work is a measure of _____________

  25. $100 Answer from Work • How much energy is transferred.

  26. $200 Question from Work • One unit for work is a Joule. A Joule is equivalent to a _______________

  27. $200 Answer from Work • Newton-meter [N-m]

  28. $300 Question from Work • How much work is done if a 20.0 N force is applied at an angle of 15.0 degrees to slide a box 4.00 meters?

  29. $300 Answer from Work • 77.3 J

  30. $400 Question from Work • How much work is done if Mr. Richter pushes against a boulder with 200 N of force for 5.5 seconds but the boulder doesn’t move?

  31. $400 Answer from Work • 0 J

  32. $500 Question from Work • How much work is done to lift a 40.0 kg barbell to a height of 2.00 m?

  33. $500 Answer from Work • 784 J

  34. Daily Double! • You have 30 seconds to submit your wagers.

  35. $100 Question from Power • Which of the following is not a definition of power? • The rate of energy transfer • How many Joules are converted to other forms of energy • The rate at which work is done • How quickly energy is converted

  36. $100 Answer from Power • B. How many Joules are converted to other forms of energy (this is a definition of work)

  37. $200 Question from Power • Which is more powerful, a student that runs up the stairs or a student that walks? Assume they have equal mass.

  38. $200 Answer from Power • A student that runs. Same work, less time.

  39. $300 Question from Power • Calculate the power of a machine that can do 2400 J of work in 8.0 seconds.

  40. $300 Answer from Power • 300 W

  41. $400 Question from Power • How much energy does a 1500 W microwave use if it is on for 40 seconds?

  42. $400 Answer from Power • 60,000 J

  43. $500 Question from Power • How powerful is a weight lifter who lifts a 400N weight 2.0 m in 1.6 seconds?

  44. $500 Answer from Power • 500 W

  45. $100 Question from Potpourri • Which force does the most work?

  46. $100 Answer from Potpourri • C

  47. $200 Question from Potpourri • Work has the same units as what other quantity?

  48. $200 Answer from Potpourri • Energy

  49. $300 Question from Potpourri • Complete the sentence: Energy can never be created or destroyed, just __________

  50. $300 Answer from Potpourri • Energy can never be created or destroyed, just converted from one form to another.

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