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8th matter & energy
matter and energy ch. 3
| Question | Answer |
|---|---|
| engergy changes ___________. | forms |
| the __________ is the indirect source for almost all of the Earth's energy. | Sun |
| _________ are burned for electrical energy or heat. | fossil fuels |
| a measurement of usable enrgy after an energy conversion | energy efficiency |
| the more energy efficient a fan or appliance is, the more electrical energy it turns into _______ | kinetic energy |
| _______ are used to make care run more efficiently | fuel injector |
| ___________ are made of several layers of light | solar cells |
| ___________ convert sunlight into electrical energy | solar energy |
| __________ is expensive to make and requires constant sunlight | solar energy |
| ________ used to generate electrical engergy | wind energy |
| ________ take up a lot of space and need a constant supply of wind | wind energy |
| _________ is used to sail ships, to grind grain, and pump water | wind energy |
| ___________ exists in different forms | energy |
| _________ has different forms, but is always conserved | energy |
| _________ improves the ways people use energy | technology |
| ___________ may produce unwanted forms of energy | energy conversions |
| _________ can exist in different physical states | matter |
| ____________ results from the vibration of particles in solid, liquid, or gas and we detect it as vibrations in our ears | sound energy |
| when wood or gasoline burns, the ________ produces heat | chemical energy |
| ___________ is hte energy that moves objects | mechanical energy |
| put a book on bookshelf | mechanical energy |
| playing an instrument | sound energy |
| wood burning | chemical energy |
| moving molecules | thermal energy |
| x-rays | electromagnetic energy |
| center of nucleus and sun | nuclear energy |
| ________ depends on an objects mass and the speed at which the object is moving | kinetic energy |
| energy of motion | kinetic energy |
| __________ is the stored energy that an object has due to its position or chemical position | potential energy |
| most obvious form of _______ results from gravity | potential energy |
| ___________ is an electric cell that produces current | battery |
| ___________ must be either recharged or replaced as their stored energy is used | batteries |
| ___________ is a group of solar cells forming a flat surface | solar panel |
| cells of a ______ convert sunlight into electrical energy | solar panel |
| ____ is getting the most work from available energy | energy efficiency |
| __________ is the law that states energy is never gained or lost, but is only changed in form | conservation of energy |
| the most obvious form of this is when it results from gravity | potential energy |
| an object can fall and release energy stored by its position | potential energy |
| electrical energy from this is used to provide the energy for such things as satelellites, hand held calculators, and experimental cars | energy efficiency |
| conversion of a greater percentage of energy into a desired form of energy | solar cell |
| why a bowling ball has more of this because its mass is greater than that of a soccer ball | kinetic energy |
| scientists use this to classify many different forms, such as mechanical, chemcial, thermal, electromagnetic, and nuclear | energy |
| _____ is the ability to cause change | energy |
| ____ is the energy motion; a moving object has the most of this at point where it moves the fastest | kinetic energy |
| ________ is stored energy or the energy an object has due to its position or chemical position | potential energy |
| states that no matter how energy is tranferred or transformed it can neither be created or destroyed | law of conservation |
| __________ is a measurement of usable energy after an energy conversion | energy efficient |
| ___ is the ratio of usable energy to the total energy after and energy conversion | energy efficiency |
| ______ is a type of technology in which light sensitive materials convert sunlight into electrical energy | solar cell |
Created by:
fhershey
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