alleryStart learning →What is the mechanical advantage of a single ordinary pulley used to lift a load?
A1, since only the force direction changes
B2, since two cable lengths pull upward
C0, since the pulley adds no useful force
D4, since the cable wraps around it twice
Answer & Solution
Correct answer: A. 1, since only the force direction changes
1. The cord over an ordinary pulley carries the same tension on both sides.
2. The pulley therefore changes the direction of the force without changing its magnitude.
3. With output equal to input, MA = Fo / Fi = 1.
4. An MA of about 2 needs a combination in which two cables pull directly on the load.
_Source: OpenStax College Physics (CC BY 4.0), Ch 9 "Statics and Torque", section 9.5 Simple Machines_
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