| A | B |
|---|
| Lever | simple machine that people use to make work easier |
| lever arm | stick or beam free to pivot at a point |
| fulcrum | point where the lever arm pivots. |
| Load | mass lifted by a lever |
| effort | force needed to move a load |
| newton | the unit measurement for effort |
| two-coordinate graph | a graph that shows relationship between two variables |
| advantage | benefit obtained by using a lever |
| class-1 lever | lever with the fulcrum in the middle and the load and effort at the ends |
| class-2 lever | lever with the load in the middle and the fulcrum and effort at the ends. |
| class-3 lever | lever with the effort in the middle and fulcrum and load at the ends. |
| diagram | drawing that describes the relationship of all the parts of a system |
| pulley | a wheel with a grooved rim in which a rope can run to change the direction of the pull that lifts a load |
| fixed pulley | a wheel that is attached to something above the load |
| movable pulley | a wheel that is attached to the load. |
| mechanical advantage | reduces the effort needed to lift a load |
| directional advantage | change in direction that results from passing a rope through a pulley |
| simple machine | any of the six basic devices that provide mechanical or other other advantage, such as pulleys and levers |
