| A | B |
|---|
| energy from the sun that is used by plants to make food | solar radiation |
| dark area created when something block light | shadow |
| sum of potential and kinetic energy | mechanical energy |
| flow of electricity through a conductor | electric current |
| energy that is due to the motion of particles in matter | thermal energy |
| unbroken path of conductors through which electric current passes | electric circuit |
| type of energy that comes from charged particles | electrical energy |
| location of an object | position |
| change in velocity over time | acceleration |
| rate at which an objects posistion is changing over time | speed |
| change in position | motion |
| tendency of an object in motion to stay in motion | inertia |
| measurment of an objects speed and direction of motion | velocity |
| mass times velocity | momentum |
| frame from which you can measure position or motion | frame of reference |
| dividing distance by the time will give you | speed |
| units of force can be measured in | newtons or pounds |
| created whenever there is friction | heat |
| cause no movement and always equal zero | balanced forces |
| cause movement and change of motion | unbalanced forces |
| force that pulls all objects together | gravity |
| a measurment of gravity is called | weight |
| friction depends on surface and the amount of | force |
| push of a pul | force |
| force that sometimes makes pushing or pulling difficult | friction |
| force that pushes an airplane | thrust |
| force that slows down objects in the air | air resistance |
| energy of motion | kinetic energy |
| energy that is stored | potential energy |
| units of work are called | joules |
| measurment of the energy used to perform a task | work |
| ability to do work | energy |
| energy can not be created or destroyed only transformed | law of conservation of energy |
| source of energy other than fossil fuels | alternative energy |
| energy that can be used up faster than its made | nonrenewable resources |
| remeniants or traces of organismas that were preserved in soil and rock | fossils |
| material formed from decayed ancient plants and animals used to produce energy | fossil fuels |
| process plants use to make food | photosynthesis |
| resource that can not be used up, source is | inexaustible |
| value that tells you whether a fossil is younger or older than another fossil is its | relative age |
| must know the exact age of rock that surrounds to get | absolute age |
| resource that can be replaced | renewable resource |
| energy frommoving water | hydroelectric |
| energy from heat within the earth's crust | geothermal |
| produced by changing the nucleus of atoms | nuclear energy |
| clean sources of energy | wind and sun |
| clean but can cause radioactive waste | nuclear energy |
| examples of fossil fuels | coal, oil, and natural gas |
