This document discusses six simple machines: lever, wheel and axle, inclined plane, screw, pulley, and wedge. It notes that a lever uses a pivot and fulcrum to move objects more easily, while wheels and axles allow wheels to support weight and roll on surfaces. Inclined planes are slanted surfaces that make moving objects easier, and a screw is used to tighten jars. A wedge is pushed into obstacles like an axe into wood.