What kind of simple machine is a doorstop?

A doorstop functions as a wedge because it is designed to be placed between the door and the floor or wall to prevent the door from moving or closing. The shape of a wedge allows it to exert force when it is pushed into a space, creating a larger area of contact that effectively blocks the door from moving.

Wedges are simple machines that convert force applied to their thicker end into a larger force that pushes outward at the thinner end. As a doorstop is typically wider at the base and tapers to a thin edge, it can efficiently distribute the force of the door against it, holding the door in place.

This design is particularly effective because it allows users to easily secure a door open without needing additional devices, demonstrating the practical application of wedges in everyday life.