The mechanical advantage for a pulley system is determined by

counting the number of strands holding the resistance force.

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counting the number of strands holding and not holding the resistance force.

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adding the radii of the pulleys.

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multiplying the radii of the pulleys.

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Solution

The correct option is A counting the number of strands holding the resistance force.

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Similar questions

Find the mechanical advantage of a block and tackle system consisting $n$ number of pulleys.

Give reasons for the following :

(a) In a single fixed pulley, the velocity ratio is always more than the mechanical advantage.

(b) The efficiency of a movable pulley is always less than $100 %$ .

(d) The lower block of a block and tackle pulley system must be of negligible weight.

Q. Weight of the pulley ____ the mechanical advantage of single fixed pulley and ____ the mechanical advantage of single movable pulley

In fig shows a block and tackle system of pulleys used to lift a load .

(a) How many strands of tackle are supporting the load ?

(b) Draw arrows to represent tension T in each strand.

(d) When load is pulled up by a distance 1 m, how far does the effort end move ?

(e) How much effort is needed to lift a load of 100 N ?

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.

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