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A single fixed pulley and a movable pulley both are separately used to lift a load of 50 kgf to the same height. Compare the efforts applied.
A single fixed pulley and a movable pulley both are separately used to lift a load of 50 kgf to the same height. Compare the efforts applied.
Class 10 | ICSE | Machines | Physics | Selina
A single fixed pulley and a movable pulley both are separately used to lift a load of 50 kgf to the same height. Compare the efforts applied.

Solutions:

We know that in case of a single fixed pulley, the effort (Ef) needed to lift a load is the load itself.

Therefore, Ef = L = 50kgf

In case of a movable pulley, the effort needed to lift a load is equal to half the load.

Therefore Em = L/2 = 50 kgf / 2

Em = = 25 kgf

Thus, the ratio of efforts applied by the each pulley is

Ef / Em = 50 / 25

Therefore, Ef : Em = 2: 1

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