| A | B |
|---|
| fulcrum | The point about which a lever pivots. |
| lever | Any rigid rod or plank that pivots, or rotates about a point. |
| inclined plane | A flat, sloped surface. |
| wedge | An inclined plane that moves. |
| screw | An inclined plane wrapped around a cylinder or post. |
| wheel & axle | A simple machine that consists of two circular objects of different sizes that are attached in such a way that they rotate together. |
| force | An influence on the shape, motion, or other characteristics of a body or system. |
| pulley | A wheel or set of wheels with grooved edges over which a rope or chain can be drawn in order to change the direction of a pulling force and increase the capacity for lifting weight. |
| friction | The resistance of a surface to relative motion, as of an object sliding or rolling over it. |
| wheel | Any instrument, device, or apparatus resembling such a disk or frame in shape, motion, or function. |
