What are simple machines?

Simple machines are defined as basic mechanical devices that provide a mechanical advantage, making work easier by allowing a person to exert less effort to move an object. They are foundational components in the study of mechanics and are often categorized into six types: the lever, wheel and axle, pulley, inclined plane, wedge, and screw.

These machines simplify the task of doing work by changing the direction or magnitude of a force. For example, a lever allows a small force applied over a long distance to lift a heavier load over a shorter distance. Because they form the building blocks for more complex machines, understanding simple machines is crucial in grasping the principles of mechanical advantage and energy conservation.

The other options describe concepts that either misrepresent simple machines or refer to more complex systems, such as devices that rely on electricity, multi-component systems, or tools for assembling larger machines, which do not align with the fundamental definition of a simple machine.