| A | B |
|---|
| machine | a device which makes work easier |
| inclined plane | a simple machine with a sloping surface |
| wedge | a special kind of inclined plane which moves |
| screw | an inclined plane which moves in a spiral fashion |
| mechanical advantage | the number of times that a machine multiplies the effort force |
| MA of an inclined plane | length of slope divided by the height |
| lever | a simple machine made up of a bar which turns or pivots around a fixed point |
| fulcrum | the fixed point around which bar on a lever is free to pivor |
| 1st class lever | fulcrum between the EF and RF; reduces amount of EF required to do work; changes direction of EF |
| 2nd class lever | fulcrum at one end, RF in middle, EF at opposite end; reduces EF but does not change the direction of the EF |
| 3rd class lever | fulcrum at one end, EF in the middle, RF at opposite end; does not change direction of EF or reduce EF |
| pulley | a wheel around which a rope or chain is passed |
| fixed pulley | pulley which changes direction of EF but does not reduce EF |
| moveable pulley | pulley which reduces EF but does not change the direction of the EF |
| wheel and axle | simple machine made up of two wheels that turn, or pivot, around the same point |
| compound machine | a machine made up of two or more simple machines |
