Facts about pulleys and gears
Using Pulleys and Gears by Wendy Sadler
12 Random Facts About Pulleys and Gears
Once upon a time a person needed to move something heavy.
Wendy Sadler
Simple Machines: Facts
Machines are all around us. A machine is something that makes it easier for us to do work such as moving heavy objects. Diagram 1 - example of a simple machine. Diagram 2 - example of a compound machine. There are generally two types of machines: simple and compound. Simple machines are ones which have only one part to do the work e.
A pulley is a wheel on an axle or shaft that is designed to support movement and change of direction of a taut cable or belt, or transfer of power between the shaft and cable or belt. In the case of a pulley supported by a frame or shell that does not transfer power to a shaft, but is used to guide the cable or exert a force, the supporting shell is called a block, and the pulley may be called a sheave.
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Flashcards
Gears and levers - Forces - Physics - FuseSchool
In science, a machine is any device that changes a force into a bigger or smaller force, or alters the direction in which a force acts. Machines come in all shapes and sizes. Simple tools such as a spade, a knife, a drawing-pin, and a nutcracker are also machines. Most levers are force multipliers. They reduce the effort needed to work against a force called the load. They magnify a small force into a larger force. When a force acts on an object that is fixed at one point, the object turns around this pivot point.
They allow us to move and transport heavy workloads with minimum effort. But, how much do you know about them? The origin of pulleys is uncertain. Historians believe that people from Mesopotamia used them to hoist water in BF. Archimedes of Syracuse, an Ancient Greek physicist who invented the principle of the lever and the screw pump, is also credited for the invention of compound pulleys. The historian Plutarch documented how the genius was able to move an entire warship loaded with men using a pulley system and his own strength.
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