Answer:
Well, pulleys help us by changing the direction of the force we use to lift an object. ... The real mechanical advantage of a pulley is in using many pulleys at once. Using multiple pulleys decreases the amount of force necessary to move an object by increasing the amount of rope used to raise the object.
Explanation:
So a single pulley essentially changes the direction of the pull or force applied that increase force.
And when a person uses two or more pulleys in a system, then the system also multiplies the force applied besides changing its direction.
