Scholastic
Scholastic: Dirtmeister: The Inclined Plane
This site from Dirtmeister gives information on how the Ancient Egyptians used the inclined plane. Dirtmeister explains the inclined plane and its uses.
Scholastic
Scholastic: Dirtmeister's Science Reporters: Simple Machines: The Screw
Scholastic provides an in-depth description here of a simple machine called The Screw. Also provides a picture and several examples for understanding.
abcteach
Abcteach: Science: Simple Machines
[Free Registration/Login Required] A collection of ready-to-go worksheets and diagrams of simple machines.