What determines the ease with which a screw can be turned?

The ease with which a screw can be turned is significantly influenced by the length of the handle. A longer handle increases the leverage applied to the screw, allowing for easier rotation. Leverage is the mechanical advantage gained when a longer distance from the pivot point, which is the screw's axis, is used to apply force. As the handle lengthens, the force exerted on the screw is amplified, making it easier to turn, regardless of factors like the screw's width or length. This principle is fundamental in mechanics and helps to minimize the physical effort needed in the turning process.