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Answers
In a pulley, the ideal mechanical advantage is equal to the number of rope segments pulling up on the object. The more rope segments that are helping to do the lifting work, the less force that is needed for the job
Answer:
A single pulley is used to change the direction of the pull to lift a load. A system of pulleys is used to lift heavy loads by the mechanical advantage of increasing the length of travel of the pull and decreasing the load. The mechanical advantage of a system of pulleys is equal to the number of ropes that support the moveable pulley, less any friction on the pulley. The amount of friction is the difference between the actual load measured and the calculated load.
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