This lesson will introduce the six types of simple machines and show how machines can increase efficiency by reducing work input needed. It is 1 of 2 in the series titled "Simple Machines."

A cart or wagon. It had commonly two wheels, but sometimes four, and it was then called the plaustrum majus. Besides the wheels and axle the plaustrum consisted of a strong pole (temo), to the hinder part of which was fastened a table of...