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A screw converts rotational force into linear force, or vice versa. A screw jack, for example, converts the rotational force of a hand lever, or a motor, that rotates around a centre pivot point, into a linear force that extends or retracts a threaded rod. The rod can be used to lift a car, open a flap, or steer a wheel.

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Another example of a screw is the Archimedes Screw, in which a long screw propeller encased in a tube. The Archimedes Screw lifts, or pumps, a fluid, such as water, through the tube to a higher location.

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A carpenter's screw uses its threads to bind objects (often pieces of wood) together. As the carpenter turns the screw, it forces the threaded shaft to drive deeper into the wood until it becomes tightly affixed.

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These examples make life easier because, in the case of a jack, people are not strong enough to lift a car, but with the aid of a screw jack, a single person can crank the jack handle and thus lift the car (or part of the car) off the ground. An Archimedes Screw made life easier, as it was the first known example of a mechanical pump that lifted fluid from one level to a higher level. The carpenter's screw makes life easier because a screw will hold pieces of wood together stronger and more securely than a nail will, and unlike most nails, a screw can be easily reversed out of the wood.
It holds things together better than a nail.

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12y ago

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