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Pulley systems are used in the real world to lift large masses onto tall heights. You might have seen the workers repairing the roof of a house and using the pulley system to lift their tools or materials to the roof. A pulley is an example of a simple machine.
The pulley system consists of one or more pulleys and a rope or a cable. The number of pulleys used may increase or decrease the mechanical advantage of the system. Generally, the higher the mechanical advantage is, the easier it is to lift the object that is being lifted.
Overall, no matter how easy it is to use the pulley system, the system itself is not very efficient due to the force of friction. For example, one has to pull two meters of rope of cable through the pulleys in order to lift an object one meter.
The applet below illustrates just that. Select the number of pulleys and drag the mouse to see the inefficiency of the system.
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Do you use more force using 1 pulley to pull an object or 1 or more pulleys?
More force is exerted with one pulley.
How does a well pulley work?
It works much more effectively, and with greater dedication, focus, and commitment, than an ailing pulley does.
What is more than one pulley working together?
Mechanical Advantage!
What is a compound pulley?
a coumpound pulley is when there is a fixe pulley and movable pulley working together
What is a simple machine made of a wheel and a cord called?
That would most likely be a pulley. A pulley is essentially a wheel on an axle that usually has a groove in the middle of its circumference that holds a rope, cable, belt, or chain. Pulleys are used to transmit motion rotationally and apply force in the direction of said motion. Two or more pulleys makes a tackle. Hope this is what you were looking for.
