How does a screwdriver function in terms of mechanical advantage?

A screwdriver primarily functions by converting linear force applied to the handle into rotational force, which allows the user to effectively turn the screw. When a person pushes down on the handle of the screwdriver, this linear motion translates into rotational motion around the axis of the screw. This mechanism enables the application of torque, which is necessary for driving the screw into materials or removing it from them.

While the application of grip strength is relevant for maintaining control of the screwdriver, it is not the primary mechanical advantage that the tool provides. Additionally, a screwdriver does not change rotational force into linear force; instead, it facilitates the use of linear force to create rotation. The size of screws is also unrelated to how a screwdriver functions, as the tool is designed to match various screw heads and sizes rather than reducing their dimensions.