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Question

A single fixed pulley is equivalent to a :

A
first order lever
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B
second order lever
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C
third order lever
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D
complex machine
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Solution

The correct option is C first order lever
Solution:
1. A single fixed pulley is really a first class lever with equal arms.
2. In Figure, the arm from point “R” to point “F” is equal to the arm from point “F” to point “E” (both distances being equal to the radius of the pulley).
3. When a first class lever has equal arms, the mechanical advantage is 1. Thus, the force of the pull on the rope must be equal to the weight of the object being lifted.

Hence A is correct option

2004705_273327_ans_83b8c1c963f5440d9d69a8a72a76b3d6.png

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