Simple screw model, Nairobi Industrial Area

The simple screw model describes a screw as an inclined plane wrapped around a cylinder. It consists of a cylindrical shaft with a helical ridge, known as the thread, that spirals around its surface. The threads allow for rotational motion to be converted into linear motion, enabling the screw to penetrate materials or fasten objects together. The distance between threads, known as the pitch, determines how far the screw advances with each full turn. This model illustrates how screws can amplify force, making them effective for lifting or holding heavy objects.