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Chapter 9 test
| Question | Answer |
|---|---|
| energy: the ability to do --- | work |
| work is a --- of energy | transfer |
| what is the difference between kinetic and potential energy? | kinetic: energy of motion potential: energy because of position |
| what is the formula for kinetic energy? | mv^2/2 |
| what does the v in the formula for kinetic energy mean? | speed |
| what is the formula for GPE? | weight x height |
| what is the height in the formula for GPE? | how far the object has to fall |
| does the height affect the amount of GPE? | yes, it makes it greater |
| what is the total energy of motion and position in an object? | mechanical energy |
| formula for mechanical energy: | pontential energy + kinetic energy |
| can mechanical energy change? (increase or decrease) | no |
| can potential and kinetic energy change? (increase or decrease) | yes |
| thermal energy | all of the kinetic energy due to random motion of the particles that make up an object |
| faster moving particles = --- kinetic and thermal energy | greater |
| chemical energy | energy of a compound that changes as its atoms are rearranged |
| food is made of --- compounds | chemical |
| electrical energy | energy of moving electrons |
| sound energy | caused by objects vibrations |
| light energy | produced by vibrations of electrically charged particles |
| nuclear energy | energy that comes from changes in the nucleus of an atom |
| electrical energy is --- energy and sound energy is --- energy | potential, kinetic |
| a change from one form of energy to another | energy conversion |
| example of elastic potential energy | rubber band |
| give an example of a conversion involving chemical energy | photosynthesis |
| are energy conversions in everything we do? | yes |
| --- help harness energy and make it work for you | machines |
| a force that opposed motion between two surfaces thar are touching | friction |
| in a --- system, energy is transferred only to each other | closed |
| the total energy in a closed system --- | stays the same |
| can energy change form one form to another? | yes |
| why is prepetual motion impossible? | a little bit of the energy is converted into thermal energy each time |
| comparison to the amount of energy before a conversion with the amount of useful energy after a conversion | energy efficency |
| if something is more efficent, does it need more or less energy to operate? | less |
| what are some examples of fossil fuels? | coal, oil, petroleum |
| what are some examples of renewable resources? | water, solar,wind, geothermal, biomass, nuclear |
Created by:
kfran0112
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