7. A pulley system has a velocity ratio 3. Draw a
diagram showing the point of application and
direction of load (L), effort (E) and tension (T).
It lifts a load of 150 N by an effort of 60 N.
Calculate its mechanical advantage. Is the pulley
system ideal ? Give reason.
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Answered by
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Answer: 2.5 and No
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Explanation: Given:
L = 150N ; E = 60N ; V.R = 3
To find the Mechanical Advantage use the formula
M.A = LOAD / EFFORT
= 150/60
= 2.5
To know if the machine is ideal, we have to know its efficiency
which is calculated by the formula :
M.A / V.R
= 2.5/3
=0.8
i.e the efficiency is = 80%
Therefore we can conclude that machine is not ideal beacause the efficiency is not 100%
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