Chapter 9 test
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| energy: the ability to do --- | work
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| work is a --- of energy | transfer
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| what is the difference between kinetic and potential energy? | kinetic: energy of motion
potential: energy because of position
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| what is the formula for kinetic energy? | mv^2/2
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| what does the v in the formula for kinetic energy mean? | speed
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| what is the formula for GPE? | weight x height
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| what is the height in the formula for GPE? | how far the object has to fall
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| does the height affect the amount of GPE? | yes, it makes it greater
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| what is the total energy of motion and position in an object? | mechanical energy
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| formula for mechanical energy: | pontential energy + kinetic energy
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| can mechanical energy change? (increase or decrease) | no
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| can potential and kinetic energy change? (increase or decrease) | yes
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| thermal energy | all of the kinetic energy due to random motion of the particles that make up an object
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| faster moving particles = --- kinetic and thermal energy | greater
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| chemical energy | energy of a compound that changes as its atoms are rearranged
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| food is made of --- compounds | chemical
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| electrical energy | energy of moving electrons
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| sound energy | caused by objects vibrations
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| light energy | produced by vibrations of electrically charged particles
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| nuclear energy | energy that comes from changes in the nucleus of an atom
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| electrical energy is --- energy and sound energy is --- energy | potential, kinetic
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| a change from one form of energy to another | energy conversion
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| example of elastic potential energy | rubber band
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| give an example of a conversion involving chemical energy | photosynthesis
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| are energy conversions in everything we do? | yes
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| --- help harness energy and make it work for you | machines
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| a force that opposed motion between two surfaces thar are touching | friction
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| in a --- system, energy is transferred only to each other | closed
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| the total energy in a closed system --- | stays the same
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| can energy change form one form to another? | yes
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| why is prepetual motion impossible? | a little bit of the energy is converted into thermal energy each time
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| comparison to the amount of energy before a conversion with the amount of useful energy after a conversion | energy efficency
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| if something is more efficent, does it need more or less energy to operate? | less
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| what are some examples of fossil fuels? | coal, oil, petroleum
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| what are some examples of renewable resources? | water, solar,wind, geothermal, biomass, nuclear
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Or sort by any of the columns using the down arrow next to any column heading.
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