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29 Cards in this Set
- Front
- Back
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an objects mechanical energy is?
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the sum of its potential and kinetic energies
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petroleum and natural gas are examples of?
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fossil fuels
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mechanical energy can be?
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all kinetic, all potential, or part kinetic and part potential
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coal burning plants use steam turbines to generate electrical energy. this is an example of...?
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energy conversion
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the __ of sugars and starches of food fuels your body functions and movements, and provides the thermal energy that keeps your temperature constant.
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chemical energy
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of the following, which type of energy is NOT correctly described?
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sound energy: energy that can transfer through a vacuum
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which of the following is NOT an energy resource?
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electric generator
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the energy used to cook food in a microwave is?
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light energy
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more efficient light bulbs produce what?
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light energy
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at the top of your jump, your __?
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potential energy is at maximum
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the thermal energy of a substance changes with the __ of its particles?
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kinetic energy
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a __ is a well defined group of objects that transfer between one another?
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closed system
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what is involved in a closed system such as a roller coaster?
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the cars, the track, and the air
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the __ states the energy can be neither created nor destroyed?
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law of conservation of energy
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how does a light bulb conserve energy?
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some is converted into thermal energy and light energy
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__ is a force that opposes motion between two surfaces that are touching?
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friction
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without the __ from the sun, life on earth would not be possible?
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nuclear energy
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geothermal energy is considered a __ resource?
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renewable
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the kinetic energy of an object can be found is the objects __ and __ are known?
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speed and mass
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after a bow is stretched, it has __ energy?
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potential
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during photosynthesis, plants__?
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use light to produce new substances with chemical energy
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nonindustialized countries rely heavily on __ for energy?
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biomass
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which of the following is NOT a renweable resource?
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nuclear energy
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our most important nonrenewable resource is?
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fossil fuels
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our most important energy source is?
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the sun
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what is the cleanest burning fossil fuel?
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natural gas
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the energy source powering the geyser Old faithful in yellowstone national park is?
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geothermal
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when one object does work another, energy is __?
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transferred
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suppose you have just lifted a 50 N bowling ball 2 m above the floor. which of the following is true?
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you performed work equal to 100 J to lift the ball
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