What is Pulley ?

Pulley A single fixed pulley changes the direction of force only and in general assumed to be massless and frictionless. It is clear from the example given below. Ex. A bucket of mass $25 \mathrm{~kg}$ is raised by a $50 \mathrm{~kg}$ man in two different ways as shown in fig. What is the action on the floor by the man in the two cases? If the floor yields to a normal force of 700 N, which mode should the man adopt to lift the bucket without the floor yielding? Sol. Here, mass of the bucket, $m=...