Question

Take a pulley. Fix it at a height. Draw a string over the pulley. Tie a load of two kilograms at one end. Hold the other end of the string and pull it downwards to lift the load, first up to a height of one metre and then up to a height of four metres. When is more work done?

Answer 1

More work is done when the 2 kg load is lifted up to a height of 4 metres.

This is because the same load is lifted through a greater distance. Since work depends on both the force applied and the distance through which the object moves, lifting the load to 4 metres requires more work than lifting it to 1 metre.