| A | B |
|---|
| inclined plane | flat, slaned surface |
| wedge | a moveable inclined plane |
| screw | inclined plane wrapped around a cylinder |
| lever | rigid bar that pivots or rotates about a fulcrum |
| fulcrum | fixed point that a lever rotates around |
| wheel & axle | 2 circular objects fastened together and rotate about an axis |
| pulley | rope or cable wrapped around a grooved wheel |
| complex machine | 2 or more simple machines combined |
| ideal mechanical advantage | no friction, 100% efficient |
| actual mechanical advantage | real machine, energy wasted due to friction |
| work | object moves a distance in the same direction as the force exerted |
| input force | force exerted by you |
| output force | force exerted by the machine |
| efficiency | output force compared to input force |
