Why screws have threads?
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Explanation:

screws have threads because to

prevent linear motion being converted to rotary, that is so the screw does not slip even when linear force is applied, as long as no external rotational force is present.

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Explanation:

Because the lead of a screw thread is chosen so that friction is sufficient to prevent linear motion being converted to rotary , that is so the screw , dose not slip even when linear force is applied, as long as no external rotational force is present.

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