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30 Cards in this Set
- Front
- Back
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the kinetic energy of an object can be found if the object's ______ are known
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speed and mass
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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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coal burning power plants use steam driven turbines to generate electrical energy. this is an example of_____
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energy conversion
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the thermal energy of a substane changes with the_______ of its particles
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kinetic energy
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the_____ in the sugars and starches of food fuels all your body functoins and movements, and provides the thermal energy tha tkeeps your body temperature constant
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chemical energy
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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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mechanical energy can be_____
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all kinetic energy, part potential and part kinetic energy, and all potential energy.
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what is NOT an energy resource?
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electric generator
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more efficient light bulbs produce more
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light energy
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what is NOT a renewable resource?
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nuclear energy
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our most important energy resource is the
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sun
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the cleanest burning fossil fuel is
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natural gas
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non industrialized countries rely heavily on ____for energy
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biomass
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fossil-fuel and nuclear power plants use____to turn a turbine that rotates the generator
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steam
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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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our most important nonrenewable resource is ____
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fossil fuel
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suppose you are jumping on a trampoline. at the top of your jump your______
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potential energy is at a maximum
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after a bow is stretched, it has____energy
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potential
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petroleum and natural gas are examples of
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fossil fuel
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geothermal energy is considered a ____resource
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renewable
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which type of energy is NOT correctly described
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sound energy: energy that can travel through a vacuum
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the energy used to cook food in a microwave is a form of_______
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light energy
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during photosynthesis, plants_______
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use light to produce new substances with chemical energy
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when one object does work on another, energy is______
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transferred
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an object's mechanical energy is______
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the sum of its potential and kinetic energies
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_______is a force that opposes the motion between two surfaces that are touching
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friction
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how does a light bulb conserve energy?
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some energy is converted into thermal energy and light energy
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the ____sates that energy can be neither created nor destroyed
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law of conservation of 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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