A crowbar is a strong metal bar used for prying things apart or lifting heavy objects. One end is usually flat and slightly curved, perfect for wedging between boards or under the edge of a crate lid. When you push down on the long handle, the curved end acts as a lever, multiplying your strength so you can pop nails loose, separate wooden planks, or lift something that would be impossible to move with your bare hands.

Crowbars are essential tools in construction, demolition, and emergency rescue work. Firefighters use them to force open jammed doors. Construction workers use them to remove old floorboards or separate materials.

The crowbar demonstrates a simple but powerful principle of physics: a long lever arm gives you mechanical advantage, turning your modest push into tremendous prying force. That's why a person with a crowbar can pull apart things that seem impossibly stuck together.