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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
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.
strategy
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.
work power and energy
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

100 question from energy
$100 Question from Energy
  • ___________ is the energy of an object in motion
200 question from energy
$200 Question from Energy
  • Pulling back a rubber band is a form of storing __________ energy
300 question from energy
$300 Question from Energy
  • Energy is a measure of an object’s _________________
300 answer from energy
$300 Answer from Energy
  • Ability to cause change
400 question from energy
$400 Question from Energy
  • What is the kinetic energy of a 15 kg boulder resting at the top of a 12 m cliff?
400 answer from energy
$400 Answer from Energy
  • 0 J (Not moving = no kinetic energy)
500 question from energy
$500 Question from Energy
  • What is the potential energy of a 15 kg boulder resting at the top of a 12 m cliff?
100 question from conservation of energy
$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.
100 answer from conservation of energy
$100 Answer from Conservation of Energy
  • A. Its kinetic energy is mostly converted to potential energy.
200 question from conservation of energy
$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!”
200 answer from conservation of energy
$200 Answer from Conservation of Energy
  • Don’t convert energy into less useful forms, like heat.
300 question from conservation of energy
$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?
400 question from conservation of energy
$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?
500 question from conservation of energy
$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?
100 question from work
$100 Question from Work
  • Work is a measure of _____________
100 answer from work
$100 Answer from Work
  • How much energy is transferred.
200 question from work
$200 Question from Work
  • One unit for work is a Joule. A Joule is equivalent to a _______________
200 answer from work
$200 Answer from Work
  • Newton-meter [N-m]
300 question from work
$300 Question from Work
  • How much work is done if a 20 N force is used to slide a box 4 meters?
400 question from work
$400 Question from Work
  • How much work is done if Mr. Richter pushes against a boulder with 200 N of force for 5 seconds but the boulder doesn’t move?
500 question from work
$500 Question from Work
  • How much work is done to lift a 40 kg barbell to a height of 2 m?
daily double
Daily Double!
  • You have 30 seconds to submit your wagers.
100 question from power
$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
100 answer from power
$100 Answer from Power
  • B. How many Joules are converted to other forms of energy (this is a definition of work)
200 question from power
$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.
200 answer from power
$200 Answer from Power
  • A student that runs. Same work, less time.
300 question from power
$300 Question from Power
  • Calculate the power of a machine that can do 2400 J of work in 8 seconds.
400 question from power
$400 Question from Power
  • How much energy does a 1500 W microwave use if it is on for 40 seconds?
500 question from power
$500 Question from Power
  • How powerful is a weight lifter who lifts a 400N weight 2 m in 1.6 seconds?
100 question from potpourri
$100 Question from Potpourri
  • Which force does the most work?
200 question from potpourri
$200 Question from Potpourri
  • Work has the same units as what other quantity?
300 question from potpourri
$300 Question from Potpourri
  • Complete the sentence:

Energy can never be created or destroyed, just __________

300 answer from potpourri
$300 Answer from Potpourri
  • Energy can never be created or destroyed, just converted from one form to another.
400 question from potpourri
$400 Question from Potpourri
  • A 1000 kg car and an 1200 kg car roll down a hill. Assuming energy is conserved, which car, if either, will be rolling faster at the bottom of the hill?
400 answer from potpourri
$400 Answer from Potpourri
  • Neither. Gravity accelerates all objects the same regardless of mass.
500 question from potpourri
$500 Question from Potpourri
  • An ice skater is gliding across the ice at a constant speed. Is she doing work?
500 answer from potpourri
$500 Answer from Potpourri
  • No. No acceleration means no force. No force means no work.
final jeopardy
Final Jeopardy:
  • Like all objects, humans need energy to cause change. What unit do humans most often use to describe their own changes in energy?
final jeopardy answer
Final Jeopardy Answer
  • The Calorie (= 4,187 Joules)