| A | B |
|---|
| machine | device that makes work easier |
| efficiency | comparison (ratio) of work input to work output |
| mechanical advantage | number of times a machine multiplies the effort force |
| inclined plane | flat, slanted surface that multiplies force |
| wedge | inclined plane that moves |
| screw | inclined plane wrapped around a central bar |
| lever | rigid bar free to move about a single point |
| fulcrum | fixed pivot point of a lever |
| pulley | rope wrapped around a wheel |
| wheel and axle | two circular objects of different sizes |
