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Question:

A moving company is trying to get a 150 kg refrigerator to the top of a two-story building. To lessen the amount of work required, they connect the refrigerator to a double pulley system like the one shown here: Which of the following statements is true about the minimum effort force required to lift the bucket if friction is ignored?

A It would take 75 kg of effort to lift the refrigerator.
Explaination

It would take approximately 75 kg of effort because a pulley system is a type of simple machine that reduces the amount of effort needed. In this case, it would reduce the force by half, but the moving company would have to pull the rope twice as far as the height of the building.