| A | B |
|---|
| kinetic energy | the energy of motion |
| hydropower | energy from falling or moving water |
| mechanical energy | potential energy + kinetic energy |
| kinetic energy | depends on speed and mass |
| renewable resources | Clues: solar energy, geothermal energy, wind energy, hydropower |
| nonrenewable resources | Clues: coal, petroleum products, natural gas |
| biomass | clues: wood, garbage plants |
| thermal energy | in every energy conversion some energy is converted into ___ |
| potential energy | the energy stored in a stretched rubber band |
| fossil fuels | examples are coal, petroleum, propane, natural gas |
| potential energy | at the highest point in a jump on a trampoline, all energy is ___ |
| the sun | the greatest, most important source of earth's energy |
| perpetual motion machine | a machine that would put out as much energy as it takes in |
| the law of conservation of energy | Energy can neither be created nor destroyed. |
| energy | the ability to do work |
| energy conversion | a change from one form of energy into another |
| nonrenewable resources | resources that can be replaced only over thousands or millions of years |
| renewable resources | resources that can be replaced over a relatively short period of time |
| biomass | organic matter that can be burned to release energy |
| nuclear energy | the form of energy associated with changes in the nucleus of an atom |
| solar energy | energy from the sun |
| wind energy | the energy from the sun's uneven heating of the Earth's surface which creates currents of air |
| potential energy | the energy of position or shape |
