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A square threaded screw is used to lift a load W by applying a force F. Efficiency of square threaded screw is expressed as

1. The ratio of work done by W per revolution to work done by F per revolution
2. W/F
3. F/W
4. The ratio of work done by F per revolution to work done by W per revolution

Correct answer: The ratio of work done by W per revolution to work done by F per revolution

Solution

The efficiency of a square threaded screw is determined by comparing the useful work output (work done by the load W) to the work input (work done by the applied force F) per revolution, which reflects how effectively the screw converts input force into lifting work.

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