gears

Home » gears

Wheel and axle – Simple machines – Physics

By |2018-09-10T13:51:45+00:00August 17th, 2017|Central Asia, Physics|

An Egyptian potter uses a pottery wheel, about 2000 BC. He uses his hand to spin the wheel. Wheels do not exist in nature, and no animals use them except people (though some animals do use gears, which are a special kind of wheel). People didn't use wheels either until the early Bronze Age, [...]

History of Bicycles

By |2018-04-11T18:26:49+00:00August 7th, 2017|Modern Europe, Science|

A velocipede Bicycles were invented bit by bit in many different countries. They grew out of earlier inventions like wheels (from Central Asia) and wheelbarrows (from China), but Karl von Drais, a German inventor, built the first riding machine with two wheels, one in front of the other, that you had to balance on, in 1817. Like wheelbarrows, this [...]