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Question

# A movable pulley is used as:

A
force multiplier
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B
speed multiplier
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C
device to change the direction of effort
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D
all the above
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Solution

## The correct option is A force multiplierThe movable pulley reduces the effort required to pull a mass by factor of 2 × number of movable pulleys. Consider a simple example of single fixed and movable pulley.In case I of fixed pulley the effort will be same as of load being lifted as tension in rope will be same across pulley, hence mechanical advantage will be 1.Feffort=FloadIn case II of movable pulley the effort will be half of that load being lifted as the forces on mass less pulley should balance, mechanical advantage will be 2.2Feffort=Fload⇒Feffort=Fload/2Movable pulley is used as force multiplier, correct answer is option A.

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