screw

A screw is an inclined plane wrapped around an axis.~www.wikipedia.org A screw is one of the few if not only machine that is a simple machine and a compound machine. the reason for this is that a screw is a inclined plane wrapped around a wedge. This is a close up of a screw 5 uses of a screw from Answers.com


 * as a fastener
 * a method of lifting as in a jack
 * A method of moving materials
 * Screw gears transfer __power__ from one direction to another
 * A screw can be used as a type of wedge to split things apart

 Read more: http://wiki.answers.com/Q/5_uses_of_a_screw#ixzz180VNNPxh [|Large Screw]