Early Societies and Ancient Civilizations
Simple machines are pretty ancient and have been around since the development of the first civilizations dating thousands of years back. There are six simple machines--the lever, wheel and axle, inclined plane, wedge, screw, axle, and pulley--have been used to adopt easier ways to get work done. In grade 4 we are asked to study the use of pulley and gears, in particular...
Diorama
