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Standard VI

Physics

Fixed Pulley

You are given...

Question

You are given four pulleys and three strings. Draw a neat and labelled diagram to use them so as to obtain a maximum mechanial advantage equal to 8. In your diagram mark the directions of load L, effort E and tension in each strand.

What assumptions have you made to obtain the required mechanical advantage ?

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Solution

Mechanical advantage = $fraction numerator L o a d space t o space l i f t over denominator f o r c e space a p p l i e d space t o space l i f t space t h a t space l o a d end fraction$ .

In above case pulley A distribute load N newton into two equal parts as N/2.
Further pulley B splits it into two equal N/4 and C splits it to N/8.

Thus,
MA = $fraction numerator N over denominator begin display style bevelled N over 8 end style end fraction$ =8

Thus to get mechanical advantage of 8 with 4 pulleys and 3 strings above fig shows the best combination

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Similar questions

Draw a diagram of combination of three movable pulleys and one fixed pulley to lift up a load. In the diagram, show the directions of load, effort and tensiom in each strand. Find : (i) the mechanical advantage , (ii) the velocity ratio, and (iii) the efficiency of the combination, in the ideal situation.

The diagram alongside shows an arrangement of three pulleys A, B and C. The load is marked as L and the effort as E.

(a) Name the pulleys A, B and C.

(b) Mark in the diagram the directions of load (L) effort (E) and tension $T_{1}$ and $T_{2}$ in the two strings.

(d) Calculate the mechanical advantage and velocity ratio of the arrangement.

(e) What assumptions have you made in parts (c) and (d)?

A pulley system has a velocity ratio 3 and an efficiency of $80 %$ . Draw a labelled diagram of this pulley system. Calculate :

(a) the mechanical advantage of the system, and

(b) the effort required to raise a load of 300 N.

Name the type of a single pulley that has an ideal mechanical advantage equal to 2. Draw a labelled diagram of the pulley mentioned by you.

Q. Draw a diagram to show how a single pulley can be used so as to have its ideal Mechanical Advantage

(M . A .) = 2

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Fixed Pulley

Standard VI Physics

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Mechanical advantage =. In above case pulley A distribute load N newton into two equal parts as N/2. Further pulley B splits it into two equal N/4 and C splits it to N/8. Thus, MA ==8 Thus to get mechanical advantage of 8 with 4 pulleys and 3 strings above fig shows the best combination