A crowbar is classified as a lever, which is one of the six classical types of simple machines.
Levers operate on the principle of balancing forces. In the case of a crowbar, it is used to lift or pry objects by applying a force to one end while the other end exerts a greater force on the object being moved. The pivot point, also known as the fulcrum, is typically located near the object being lifted. This arrangement allows a small amount of applied force to lift a heavier weight, making the crowbar an effective tool for tasks such as removing nails, lifting heavy planks, or loosening stuck items.
The efficiency of the crowbar as a lever illustrates how simple machines can make work easier by allowing us to exert force in a more advantageous manner.