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One of the complex machines that pulleys are used in is the elevator. The elevator car is lowered or raised by large cables and a pulley at the top. The end of the cable has counterweights that balance the weight of the car and passengers. The electric motor turns the pulley so the car moves up and down. Even though you may not notice them, pulleys are everywhere such as on bikes, cable trams, ski lifts, and more.
Pulleys can also be connected to be more powerful. For instance, if you connect two pulleys together, the rope is connected around both pulley wheels. This allows more weight to be lifted since the force raising the weight is double the effort pulling the rope...
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