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All Wound Up.(twisting motion)(Brief Article)
The twisting motion of a screw changes the direction of the force, or pressure, from a turning movement to a movement in a straight line. If you've ever seen a screw turned into a piece of wood, you can see how the turning motion of the screw makes a deep, straight cut into the wood.
A helicopter's rotor and ship's propeller work the same way. The turning motion of the helicopter's rotor forces air downward and helps lift the helicopter. The ship's propeller pushes against the water and helps move the ship forward.
A screw can be used to hold things together or push things apart. It can also be used to move things up along its ridges. The ridges around a screw are called its threads. The threads of a screw can be compared to a winding inclined plane.
* What to observe
How is a screw like a winding inclined plane?
* What you need
* construction ...
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Source: HighBeam Research, All Wound Up.(twisting motion)(Brief Article)