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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 • 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 • 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 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 • ___________ is the energy of an object in motion
$100 Answer from Energy • Kinetic energy
$200 Question from Energy • Pulling back a rubber band is a form of storing __________ energy
$200 Answer from Energy • Potential
$300 Question from Energy • Energy is a measure of an object’s _________________
$300 Answer from Energy • Ability to cause change
$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 • 0 J (Not moving = no kinetic energy)
$500 Question from Energy • What is the potential energy of a 15 kg boulder resting at the top of a 12 m cliff?
$500 Answer from Energy • 1764 J
$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 • A. Its kinetic energy is mostly converted to potential 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 • Don’t convert energy into less useful forms, like heat.
$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?
$300 Answer from Conservation of Energy • Heat (from friction)
$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 • 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 • Work is a measure of _____________
$100 Answer from Work • How much energy is transferred.
$200 Question from Work • One unit for work is a Joule. A Joule is equivalent to a _______________
$200 Answer from Work • Newton-meter [N-m]
$300 Question from Work • How much work is done if a 20 N force is used to slide a box 4 meters?
$300 Answer from Work • 80 J
$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?
$400 Answer from Work • 0 J
$500 Question from Work • How much work is done to lift a 40 kg barbell to a height of 2 m?
$500 Answer from Work • 784 J
Daily Double! • You have 30 seconds to submit your wagers.
$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 • B. How many Joules are converted to other forms of energy (this is a definition of work)
$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 • A student that runs. Same work, less time.
$300 Question from Power • Calculate the power of a machine that can do 2400 J of work in 8 seconds.
$300 Answer from Power • 300 W
$400 Question from Power • How much energy does a 1500 W microwave use if it is on for 40 seconds?
$400 Answer from Power • 60,000 J
$500 Question from Power • How powerful is a weight lifter who lifts a 400N weight 2 m in 1.6 seconds?
$500 Answer from Power • 500 W
$100 Question from Potpourri • Which force does the most work?
$200 Question from Potpourri • Work has the same units as what other quantity?
$200 Answer from Potpourri • Energy
$300 Question from Potpourri • Complete the sentence: Energy can never be created or destroyed, just __________
$300 Answer from Potpourri • Energy can never be created or destroyed, just converted from one form to another.
