| A | B |
|---|
| efficiency | the relative effectiveness of a system or device determined by comparing input and output |
| energy | a quantity that describes the capacity to do work; a source of usable power |
| force | a quality that tends to produce movement or acceleration of a body in the direction of its application; a push or pull |
| fulcrum | the pivot point of a lever |
| inclined plane | a type of simple machine; a slanted surface that makes it easier to move a mass from a lower point to a higher point |
| lever | a type of simple machine; consists of a rigid bar that pivots about a fulcrum, used to transmit and enhance power or motion |
| pulley | a type of simple machine; a circular lever, usually a wheel with a groove where a rope can be placed and used to change the direction of a force |
| screw | a type of simple machine that consists of an inclined plane wrapped around a cylinder |
| wedge | a type of simple machine that consists of an inclined plane used to separate two objects |
| wheel and axle | a type of simple machine that consists of a rod driven through the center of a cylinder that is allowed to rotate freely, yielding a mechanical advantage equal to the cylinder’s diameter |
