WHAT DOES A SCREW DO?
WHAT DOES A SCREW DO Screws do one basic thing. They convert a force that goes around and around into a force that goes up and down. This force can be used to push against an object. The up and downforce generated by a screw can also be used to hold things together. Screws can thread into a metal nut and the up and down force holds the two together. One big advantage of screws used as fasteners is that they can be removed and reinserted many times without losing their effectiveness. They have greater holding power than nails and can be easily disassembled and reused. Screws can also be used to lift things. A device called an auger is used for lifting or pumping water or another liquid. As the screw turns in the water, the water is lifted. This is also how a concrete mixer (truck) unloads its load of concrete. HOW DOES IT GET POWER? A screw is powered by the movement of the screwdriver. It converts this rotational force (called torque) into up and downforce. A screw