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Movable pulley – Simple machines – Physics

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

Bike hoist pulleys A movable pulley is a way to use a pulley to make it easier to move heavy things - to get a mechanical advantage. In the picture, someone is trying to pull their bike up to the ceiling so it will be out of the way. They've used two fixed pulleys, attached to [...]

Pulley – Simple machines – Physics

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

Clothesline pulley A pulley is really a kind of wheel, just as a screw is a kind of inclined plane. But pulleys are so important that people give them their own category. A pulley is a wheel with two raised edges. The raised edges are so that a rope or a string will run along the wheel [...]

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 [...]

Weight machines – Pulley project – Physics

By |2018-05-31T11:49:14+00:00August 16th, 2017|Physics|

Weight machines involve lots of pulleys An exercise machine is a great example of a pulley system. If you can get to a gym or a community center that has weight-lifting machines, check out the pulley system on the machine. What is the mechanical advantage? Why are they using pulleys? More about pulleys [...]

Who was Archimedes? Eureka!

By |2018-04-23T13:58:51+00:00July 18th, 2017|History|

Syracuse, Sicily, with Mount Etna in the background Archimedes was born about 287 BC, so he was a little younger than Euclid. Archimedes' father was an astronomer. Because Archimedes was related to the tyrant who ruled Syracuse, on the island of Sicily, he lived his whole life in Sicily, except when he went to study at the University of [...]