| A | B |
|---|
| Energy | Ability to do work |
| Joule | one newton-meter is equel to one of these |
| Law of conservation of energy | Energy is never created or destroyed |
| newton-meter | The combined units of force and distance used to quantify work |
| Work | Force times distance |
| Efficiency | The ratio of work out put to work input |
| Perpetual motion machine | an imaginary machine that can be 100 percent efficient |
| Power | the amount of work preformed over time |
| watt | one joule of work done in one second |
