Which simple machine uses a cylindrical rod to turn?

The simple machine that uses a cylindrical rod to turn is the wheel and axle. This machine consists of two circular objects of different diameters that are connected. The larger circular part, the wheel, can be turned using the smaller cylindrical part, the axle. When the wheel rotates, it causes the axle to turn as well, allowing for the movement of objects or the application of force over a distance.

This mechanism is fundamental in many machines and vehicles, as it reduces friction and makes it easier to move heavy loads with less effort. The wheel and axle system represents one of the six classic simple machines, showcasing how rotational motion can be effectively transferred and utilized in various applications. Understanding this allows us to appreciate the crucial role of this simple machine in mechanics and engineering.