A screw is an inclined plane wrapped in ridges (threads) around a cylinder. The distance between these ridges defines the pitch of the screw and this distance is how far the screw advances when it is turned once. The mechanical advantage of a screw is its circumference divided by the pitch.
A screw is most like which of the following other simple machines?
wheel and axle |
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block and tackle |
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inclined plane |
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first-class lever |