Pulley (Second Order) Lecture by Ms. Apurva Vashishth.
second system of pulleys consisting of two blocks. The upper block carries three wheels which freely rotate about their individual central axes and are supported over a single common axle which is firmly fixed to a rigid upper frame. The lower block also contains similar pulley and axle mechanism; however the whole structure is supported by one end of an intertwined string configuration passing through the pulleys, as illustrated in the figure. The other end termination of the string which passes across the uppermost pulley is used for the application of the effort. The weight is supported by the axle of the lower block. And as usual MA and the efficiency may be written as given for the first system of pulleys.