The '''screw''' is a [[simple machine]] often used in conjunction with a [[screwdriver]] to bore into a piece of [[wood]]. A screw's mechanical advantage is equal to the circumference of the screwdriver handle divided the the screw's pitch, the distance from one thread to the next.<ref>http://www.cosi.org/files/Flash/simpMach/sm1.swf</ref> | The '''screw''' is a [[simple machine]] often used in conjunction with a [[screwdriver]] to bore into a piece of [[wood]]. A screw's mechanical advantage is equal to the circumference of the screwdriver handle divided the the screw's pitch, the distance from one thread to the next.<ref>http://www.cosi.org/files/Flash/simpMach/sm1.swf</ref> |