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.