- from Simple Machines
The first wedges appeared in the form of stone-cutting tools like knives and axes. Since then, they’ve become larger and stronger, as well as smaller and more delicate.
A wedge is a form of inclined plane. It’s made of two inclined planes placed back to back. However, inclined planes don’t move, while wedges do. Wedges are most commonly used to push things apart. For example, an axe or even a nail can split or push apart a piece of wood. The bow of a ship can push apart water as the ship moves along. A wedge can also be used to tighten or hold things in place—for example, a doorstop.