| A | B |
|---|
| work | force times distance |
| force | a push or a pull |
| lever | a solid bar that turns or rotates around a fixed point |
| lever arm | a stick or beam free to pivot at a point |
| fulcrum | the point where the lever arm pivots |
| load | the mass lifted or the resistance overcome |
| effort | the force needed to move a load |
| pulley | a wheel with a grooved rim in which a rope can run |
| fixed pulley | has a wheel attached to something above the load |
| movable pulley | the wheel moves with the load |
| mechanical advantage | reduced effort from using a machine |
| directional advantage | a change of direction that results from using a machine |
| spring scale | an instrument used to measure force |
| Joule | the unit used to measure work |
| Newton | the unit used to measure force |
| first class lever | the fulcrum is in the middle |
| second class lever | the load is in the middle |
| third class lever | the effort is in the middle |
