Physics

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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Given,

Effort = 60 N

Load = 150 N

As we know,

$M.A. = \dfrac{\text {Load}}{\text {Effort}} \\[0.5em]$

Substituting the values in the formula for M.A. we get,

$M.A. = \dfrac{150}{60} \\[0.5em] \Rightarrow M.A. = 2.5 \\[0.5em]$

Therefore, Mechanical advantage = 2.5

For an ideal case the M.A. should be equal n, where n is the number of pulleys of the pulley system.

In this case as the mechanical advantage is less than 3 ( i.e. the number of pulleys ) so the pulley system is not ideal.

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