DefinitionEasy2 marks
With reference to the terms Mechanical Advantage, Velocity Ratio and efficiency of a machine, name and define the term that will not change for a machine of a given design.
Topic: Machines, levers and pulleys
Previous-year question practice database
Answer
Exam answer
Velocity Ratio (VR): the ratio of distance moved by effort to distance moved by load.
Explanation
For a machine of fixed design, VR is fixed by geometry.
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The Velocity Ratio (VR) of a block and tackle system of two pulleys with the effort in the upward direction is:
(a) 1
(b) 2
(c) 3
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