Science Buddies
Science Buddies: Give It a Lift With a Lever
Simple machines allow us to do difficult tasks like lifting objects heavier than our body weight. In this science project you'll build a tabletop lever and measure how much effort it takes to lift an object by altering the length of the...
Scholastic
Scholastic: Dirtmeister's Science Reporters: The Lever
This site provides a description of the lever and its many uses.
Science Struck
Science Struck: Simple Machine: All About the Wheel and Axle
Describes some history of the wheel and axle, how it works, the formula for calculating its mechanical advantage, and some applications of the wheel and axle.