Screws change a gentle turning force into a strong forwards force. They do this with a spiral pattern called a “thread”, which runs round and round the screw from the wide top to the narrow end. Each time the screw is turned, the thread pulls it a short distance along.

How does a screw work in simple words?

A screw is a mechanism that converts rotational motion to linear motion, and a torque (rotational force) to a linear force. It is one of the six classical simple machines. ... The screw passes through a hole in another object or medium, with threads on the inside of the hole that mesh with the screw's threads.

How does a screw work simple machine for kids?

Concept 2 – Rotational motion to vertical motion

A screw takes rotational motion and turns it into vertical motion. When you turn a screw, it moves down or up, depending on which way you turn. To demonstrate / let kids experience it: take a very long bolt. Spin a nut around it.