| |
| | Simple Machines [encyclopedia] (Site not responding. Last check: 2007-11-04) |
 | | The mechanical advantage of a simple machine is also affected by factors such as friction and elasticity, however, and so will usually differ somewhat from its theoretical value. |
 | | These simple machines fall into two general classes; those dependent on the vector resolution of forces (inclined plane, wedge, screw, toggle joint) and those in which there is an equilibrium of torques (lever, pulley, wheel). |
 | | Simple machines are often used in combination as components of more complex machines; for example the Archimedes screw, which is a pump, is an example of a complex machine where the screw is a helical inclined plane. |
| kosmoi.com /Science/Physics/Machines (650 words) |
|