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# Pulleys

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by

## Nabiha Farrukh

on 27 March 2013

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#### Transcript of Pulleys

An amazing simple machine Pulleys Introduction History about pulleys Different types of pulley systems Different types of pulleys Experiment Conclusion There are 3 kinds of that Pulleys provide a mechanical advantage when lifting heavy loads, they make the job much
much easier.

Fixed Pulleys has an axle that is enchored in place,
it is used for changing the direction of the force on belts and ropes. This pulley spreads the weight of the load evenly.

Movable Pulleys has a free moving axle wich means when lifting a heavy load it has the ability to move the load around.

Combined Pulleys is combined with the fixed pulley and the movable pulley it is easier to handle because you use less effort to lift the load.
When more effort expended it reduces the loads weight by half. How a pulley works in real life! In conclusion we have descovered, that pulleys
are one of the most useful simple machines.
Some, can lift light objects like a flag, while others can lift bicycles, cages and even chandeliers up to the sealing. Pulleys are all around us. They make our everyday tasks alot easier. A pulley works by transferring energy to make it easier to move heavy objects. The purpose of a pulley system is to move heavy objects with less effort. Pulleys are an easy machine to make our life easier on a daily basis. Cranes are a great example of a pulleys without the simple mechanics we wouldn't be able to have the sky scrapers or buildings we have today. Mechanical advantage of a pulley To calculate the effort required to lift the load we divide the load