A knife is classified as a simple machine, specifically a wedge.
To understand this better, let’s break it down. A simple machine is a device that changes the direction or magnitude of a force. Knives operate by applying a force to cut through materials, and they do this effectively because of their design.
A wedge, in particular, is a type of simple machine that consists of two inclined planes that meet at a sharp edge. When you apply force to the handle of a knife, the sharp edge of the blade pushes against the material, splitting it apart. This action makes the knife a very efficient tool for cutting.
In conclusion, while a knife might seem straightforward, its functionality lies in its classification as a wedge, allowing it to convert the effort you exert into a powerful cutting action.