The screw is made from a cylinder and a rounded incline plane to twist and wedge it's way into the point. A screw is used to tighten, hold together, or focus pressure into a single point. The screw is used in almost every kind of machine you use daily or just for fun. Believe it or not the screw is another type of inclined plane. The way that screws are used is the sharp metal edge on the screw is used to penetrate a hole and can alow the board or whatever the materials are to move or slide or to bind and tighten together.
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