Many simple machines have been created even since the early times. According to Ron Kurtus from his website article, "Simple Machines", the ancient Egyptians used levers to lift stones to build their pyramids and ramps to raise them to the top. Also he states that in Roman times, stones were tossed at enemies using catapults. The catapults used levers to fling the stones, and pulleys to pull down the arm of the catapult. The purpose of all of these simple machines is to lessen the amount of work or effort that you must put into a job. …
