[ Ссылка ] presents:What is a Pulley? (With Narration)

Learn what is a pulley with narration - Simple machines for kids and educational videos by Mocomi

What is a Pulley?

A basic pulley comprises of a wheel on a fixed axle, with a groove along the edges to guide a rope or cable.

Here,
Load = the weight of an object
Effort = the amount of force required to lift or move this object.

When you put two or more wheels together and run a rope around them, you have created a great lifting machine.

As you add more pulleys, you increase your mechanical advantage and it becomes very easy to life the same load.

The trade-off is that as you increase the number of pulleys, you require a greater amount of rope to achieve the same result. Since you have decreasesd the effort needed to lift the load you have to apply the force for a longer period of time.

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