Which of the following statements best explains the usefulness of a pulley system with at least one moveable pulley?

1. A pulley system is useful because pulling the rope a short distance causes the weight to be pulled very high.

2. A pulley system is useful because much more work is done by the pulley system on the weight than is done by the person pulling the rope.

3. A pulley system is useful because it produces a large output force given a small input force.

4. A pulley system is useful because it converts a large input force into a small output force.A pulley system is useful because pulling the rope a short distance causes the weight to be pulled very high.