lever

Home » lever

Screw – Simple machines – Physics

By |2018-05-31T11:49:15+00:00August 17th, 2017|Physics, What|

A cider press with big wooden screws People always count screws as a separate kind of simple machine. But really screws are just one kind of inclined plane. They are such an important kind that we give them their own category. Like most other simple machines, screws also exist in nature. The hip joints of [...]

Types of lever – Simple machines – Physics

By |2018-05-31T11:49:32+00:00August 17th, 2017|Physics|

Types of lever: What kind of lever is a see-saw? Three types of lever All levers fall into one of three types of lever. How can we tell which lever is in which class? The main difference is what order the different parts come in. Every lever has three parts: the force, the [...]

Levers – Simple machines – Physics

By |2018-05-31T11:49:33+00:00August 17th, 2017|Physics|

Levers: An orangutan child using a stick as a lever What is a lever? A lever is basically just a long stick that you push or pull against a fulcrum - a fixed object - to move something. A lever helps you move something heavy, or make something go fast. The earliest levers developed [...]

Simple machines – Physics

By |2018-05-31T11:49:24+00:00August 17th, 2017|Physics|

An example of a screw, a wedge, a wheel and axle, and a lever Machines are ways to make it easier to do work. Many plants and animals have evolved natural machines like arm muscles (a kind of lever) or teeth (a kind of wedge) or a bacteria's flagellum (a kind of screw). Many animals also make machines out of [...]

Wine-making and wine presses – History

By |2018-04-20T00:22:01+00:00June 23rd, 2017|Food, West Asia|

Roman slaves treading grapes Wine-making started out pretty simple: you picked the grapes and put them in a big concrete box, and then barefooted people - usually enslaved people - got into the box and stepped on the grapes over and over until they were all crushed and their juice ran out of [...]