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8th gr Science
Work & Energy
| Question | Answer |
|---|---|
| the scientific study of matter, energy, space, time and the relations between them | physics |
| the use of force to move an object over a distance | work |
| the unit used to measure work | joule |
| one ____ of work is done when a force of one newton moves an object has due to its position | joule |
| stored energy or the energy an object has due to its position | potential energy |
| the energy of motion | kinetic energy |
| a moving object has the most __________ at the point where it moves the fastest | kinetic energy |
| a combination of kinetic energy and potential energy an object has | mechanical energy |
| a law stating that no matter how energy is transferred or transformed, all of the energy is still present in one form or another | Conservation of energy |
| the rate at which work is done | power |
| the unit used to measure power | watt |
| one __ is equal to one joule of work done in one second | watt |
| the unit of measurement for engines in one second | horsepower |
| one ______ equals 745 watts | horsepower |
| states that energy can be transferred, transformed, but never lost | law of conservation |
| potential energy is transformed into ______, which is energy of motion | kinetic energy |
| _____ is the rate at which work is done | power |
| equals force times distance | work |
| two factors needed to know to calculate how much was done in any situation | size of force and distance over which the force was applied |
| newton meter | joule |
| the energy associated with electrical and magnetic interacations | electromagnetic energy |
| stored energy | potential energy |
| the potential energy stored in the nucleus of an atome | nuclear energy |
| potential energy + kinetic energy | mechanical energy |
| energy stored in a chemical bond that holds chemical compounds together | chemical energy |
| the energy of motion | kinetic |
Created by:
fhershey
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