What is the main function of a spring in mechanical systems?

In mechanical systems, the primary function of a spring is to store energy and exert a restoring force when it is deformed. When a spring is either compressed or stretched, it stores potential energy based on the amount of deformation it undergoes. When the force causing the deformation is removed, the spring will return to its original shape, thereby releasing the stored energy and exerting a force in the process. This property of springs is essential in various applications, such as in suspension systems in vehicles, where they absorb shock and maintain a stable ride, or in mechanisms that require a return action, like in devices with levers or buttons.

While the other options describe functions that might be found in different components or materials, they do not accurately represent the specific role of a spring in mechanical systems. Conducting electricity pertains to conductive materials rather than mechanical springs, and creating motion by rotating aligns more with gears or motors. Providing structural support could describe some uses of springs, but it is not their main function, which centers on energy storage and the restoration of form after deformation.