Rigid bars that turn about an axis. The axis or fulcrum can be visualized as a pivot point. In the body the bones represent the rigid bars and the joints are the axis (fulcrum).
A rigid bar used to modify direction, force, and motion. A type of simple ma chine that provides the user with a mechanical advantage. Levers are used to facilitate the moving and lifting of objects too heavy or awkward for one to move unassisted.