| A | B |
|---|
| machine | device that changes the amount of force you have to use to get something done. |
| inclined plane | a flat surface whose ends are at different heights |
| screw | an inclined plane wrapped around a cylinder or a cone. |
| wedge | simple machine that uses two inclined planes to push things apart. |
| lever | a bar that goes up and down over a point |
| fulcrum | the point around which a lever pivots |
| first class lever | uses a fulcrum in the middle. |
| second class lever | has resistance (load) in the middle |
| third class lever | has effort in the middle |
| pulley | a simple machine consisting of a chain/rope which goes around a grooved wheel |
| single pulley | only changes direction of force, does not reduce force. |
| double pulley system | Reduces the force needed to lift an object |
| axle | a rigid bar that's inserted through a hole in a wheel. |
| gear | a wheel with teeth along its edge |
| gear train | a series of intermeshing gears. |
