| A | B |
|---|
| compound machine | A machine that is made up of two or more simple machines. |
| fulcrum | The fixed point around which a lever pivots. A teeter-totter has one in it's center. |
| inclined plant | A simple machine with a sloping surface. It allows objects to be raised or lowered from one level to another without lifting them. Example: ramp |
| lever | A simple machine made up of a bar that turns, or pivots, around a fixed point (a fulcrum). This machine helps life heavy objects with less effort. Example: crowbar |
| machine | A device that makes work easier by reducing the force needed to do a job. |
| mechanical advantage (MA) | The number of times that a machine multiplies the effort force applied to it. To find the MA of an inclined plane, divide the length of its sloping surface by its height. |
| pulley | A simple machine made up of a wheel, or wheels, around which a rope or chain is passed. It helps lift objects that would be too heavy to lift directly. |
| screw | An example of an inclined plane that moves. |
| wedge | Two inclined planes placed back to back. It is used to push objects or materials apart. |
| wheel and axel | A simple machine made of two wheels that pivot around a center rod. Example: a doorknob |
