A lever is a beam connected to ground by a hinge, or pivot, called a fulcrum. The ideal lever does not dissipate or store energy, which means there is no friction in the hinge or bending in the beam.

Learn the noun and verb meanings of lever, a word for a bar or rod that transmits force or motion. See synonyms, examples, word history, and related entries.

A lever is a simple machine that can move, lift, or propel objects by reducing the force applied. Learn about its parts, types, mechanical advantage, and applications with diagrams and examples.

Lever, simple machine used to amplify physical force. All early people used the lever in some form, for moving heavy stones or as digging sticks for land cultivation. The principle of the lever was used in the swape, or shaduf, a long lever pivoted near one end with a platform or water container.

A lever is simply a plank or ridged beam that is free to rotate on a pivot. It is perfect for lifting or moving heavy things. It is a useful simple machine, and you can find them everywhere. Good examples of levers include the seesaw, crowbar, fishing line, oars, wheelbarrows, and the garden shovel. Parts of a lever.