| A | B |
|---|
| Work | done when a force causes an object to move in the same direction the force is applied |
| Joules | unit for work |
| Power | how quickly work is done |
| Watts | unit for measuring power |
| input force | the force that you apply on a machine |
| output force | the force that the machine applies |
| mechanical advantage | the number of times a machine increases the input force |
| efficiency | ratio of the output work to the input work |
| percent % | the unit for measuring efficiency |
| simple machine | machine that does work with only one movement. |
| compound machine | a machine made up of a combination of simple machines |
| inclined plane | flat, sloped service |
| wedge | an inclined plane that moves. can have one or two sloping sides |
| screw | an inclined plane that is wrapped around a cylinder or post |
| lever | any rigid rod or plank that pivots, or rotates, about a point |
| wheel and axle | made up of two circular objects of different sizes that are attached in such a way that they rotate together |
| pulley | consists of a grooved wheel with a rope or cable wrapped over it |
