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Question
During his experiments with a single movable pulley, Jas determined the effort, mechanical advantage and efficiency as X, Y and Z, respectively. Subsequently, after lubricating the pulley thoroughly, he recalculated the effort, MA and efficiency. X', Y' and Z' respectively. Which of the following relationships accurately represents the scenario?
Options
X' > X
Y' < Y
Z' > Z
Z' = Z
MCQ
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Solution
Z' > Z
Explanation:
Lubrication reduces friction, so less effort is needed to lift the same load. The mechanical advantage and efficiency increase, while the velocity ratio remains unchanged. Therefore, the efficiency after lubrication is greater.
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