What type of simple machine is a screw?

A screw is classified as a type of inclined plane because it consists of a helical structure wrapped around a cylindrical core. The threads of the screw resemble a spiral inclined plane, enabling it to convert rotational motion into linear motion, which allows it to be driven into materials and hold objects together.

By turning the screw, the inclined plane principle enables the application of force along its threads, which decreases the amount of force required to fasten or secure items. This functionality is essential in various applications, such as in woodworking or metalworking, where screws provide a strong and stable fastening solution.

Other options represent different types of simple machines. A lever operates on a fulcrum to amplify force, a wedge is used to separate materials, and a pulley changes the direction of force to lift loads. Each of these has distinct mechanical advantages and applications, but the screw aligns specifically with the characteristics of an inclined plane.