| A | B |
|---|
| work | a force acting over a distance |
| joule | the unit for measuring work |
| power | the rate at which work is done |
| watt | the unit for measuring power |
| machine | any device that makes work easier |
| work input | work that goes into a machine (effort force) |
| work output | the work that comes out of a machine |
| efficiency | a comparison of work input to work output |
| mechanical advantage | the number of time that a machine multplies effort force |
| inclined plane | a flat, slanted surface (ramp) |
| wedge | an inclined plane that moves |
| screw | an inclined plane wrapped around a cylinder |
| lever | a rigid bar that moves freely around a fixed point |
| fulcrum | the fixed point of a lever |
| pulley | a rope, belt, or chain wrapped around a wheel |
| wheel and axle | made up of 2 circular objects of different sizes |
| compound machine | consists of 2 or more simple machines working together |
