* Leverage and Friction: Nails are designed with a pointed tip to concentrate force, making it easier to penetrate materials like wood. Once driven in, the friction between the nail's surface and the surrounding material creates a strong hold, preventing the materials from easily separating. This friction acts as a barrier against the work needed to pull the materials apart.
* Simplified Assembly: Compared to other methods like using adhesives or tying materials, nails offer a quick and straightforward way to assemble items. You don't need to wait for glue to dry or intricately weave knots. The ease and speed of using nails reduce the time and effort (work) required for construction and repair projects.
Essentially, nails provide a mechanical advantage, allowing you to use less force to achieve a strong and stable connection between materials.