A pulley is just a wheel with a groove to hold a belt ,rope or chain. Your car likely has pulleys to run the radiator fan , the water pump , the air conditioner and the Power Steering. Elevators have a pulley. Your furnace probably has a pulley driven fan or pump. Movie projectors and video tape players have pulleys. Bicycles has a pulley to allow the pedal crank shaft to turn the drive wheel.
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They are not. I have not only ever used a waterfall for messing about when I was young.
The pulley was used by the Romans to move large pieces of equipment and to create buildings. Pulleys were also used in the creation of weapons.
For that you'll want Google Images, and pulleys,please see link provided.
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Most people go their daily lives without thinking of proof - more's the pity!