What is a screw?

A screw is defined as a tool that converts rotational motion into linear motion. It consists of a cylindrical shaft with a helical groove, allowing it to be driven into a material or surface when rotational force is applied. As the screw rotates, the helical thread pushes it forward in a linear direction, effectively transforming the circular motion into a straight movement. This principle is utilized in various applications, from fastening materials together to lifting objects.

Understanding how a screw operates highlights its role as a simple machine that aids in tasks requiring force amplification or control over movement. While options relating to energy storage, straight-line actions only, and levers might describe different mechanical concepts, they do not accurately capture the function and application of screws in transforming motion. The definition reflects the fundamental principles of simple machines and illustrates how screws are integral in increasing efficiency in mechanical tasks.