Which of the following is a key characteristic of a simple machine?

A key characteristic of a simple machine is that it facilitates work with one movement. Simple machines are designed to make work easier by applying a mechanical advantage. This means they can change the direction, magnitude, or speed of a force with minimal input. Common examples of simple machines include levers, pulleys, and inclined planes, all of which allow a single movement to accomplish a task, such as lifting a load or splitting an object.

The notion of requiring multiple movements is contrary to the definition of a simple machine, which is precisely intended to simplify tasks and potentially reduce the number of movements needed. Additionally, simple machines do not have to be electronic; they can operate through purely mechanical means. Finally, while some machines may need an external power source, simple machines can function solely based on applied physical force or gravity, eliminating the necessity for external power. Thus, the ability to facilitate work with just one movement is what truly defines a simple machine.