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Simple Machine Timeline

Mr.Baxter Period 5 project

Jameka Taylor

on 3 April 2013

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Transcript of Simple Machine Timeline

The Pulley For example, now that we have the pulley we can raise a flag up a pole, use a crane for construction, we have elevators that take you up and down to a certain floor, we can use use certain exercise machines, open and close curtains, and extend ladders. Simple Machine Timeline The invention of the pulley, over time affected society, our civilization and our basic way of life because it made things easier for us. Pulleys are often used to lit objects, such as bricks, flags, and pianos. Pictures An elevator A workout machine Citations Thanks for watching my Prezi presentation!!!! A crane http://www.ehow.com/list_7231681_examples-pulleys-everyday-life.html#page=1 http://www.machine-history.com/node/309 http://www.ehow.com/how-does_5004272_pulley-system-work.html http://www.beaconlearningcenter.com/weblessons/simplemachines/machines014.htm http://sprott.physics.wisc.edu/pickover/physics-book.html By: Jameka Taylor http://www.ehow.com/facts_5824536_pulleys.html#ixzz2Nu44FZ6R http://www.dailyherald.com/article/20121218/news/712189835/?interstitial=1 The largest ancient Egyptian pyramid which was the Pyramid of Khufu that was constructed in 2650 B.C.was built using a pulley. Possibly by 1500 BC people in Mesopotamia used rope pulleys for hoisting water. Archimedes of Syracuse invented the first compound pulleys 287 BC - 212 BC. Plutarch reported that Archimedes moved an entire warship, laden with men, using compound pulleys and his own strength. Also in the 12th century, people used pulleys to build cathedrals. There are different types of pulley systems:

Fixed or class 1 pulley has a fixed axle. That is, the axle is "fixed" or anchored in place. A fixed pulley is used to change the direction of the force on a rope (called a belt). A fixed pulley has a mechanical advantage of 1. A mechanical advantage of one means that the force is equal on both sides of the pulley and there is no multiplication of force.
Movable or class 2 pulley has a free axle. That is, the axle is "free" to move in space. A movable pulley is used to multiply forces. A movable pulley has a mechanical advantage of 2. That is, if one end of the rope is anchored, pulling on the other end of the rope will apply a doubled force to the object attached to the pulley. The pulley is a simple machine. The purpose of a pulley system is to be able to move a heavy object with less effort. It is made up of a rope or belt that is wrapped around wheels. The wheels are attached to brackets on the sides so that they can turn freely. The brackets are attached to fixed points, such as a ceiling, or in some cases to the object being lifted. The rope is pulled from one end and makes its way through the pulley, while the object is lifted on the other end. The more pulleys that are used, the less effort is needed to lift the object. However, if more pulleys are used, then more rope must be pulled to move the object as far.

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