Give two reasons why the efficiency of a single movable pulley is not 100%

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Solution

(i) There is always some friction between the pulley and the string
(ii) The string is not weghtless.

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Give two reasons why the efficiency of a single movable pulley is not $100 %$ .

Q. Give two reasons why the efficiency of a single movable pulley system is not

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In a single movable pulley system, a load of 225 kgf is lifted by an effort of 75 kgf. Velocity ratio of the single movable pulley is 4. Find the percentage efficiency of the system.

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.

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Give two reasons why the efficiency of a single movable pulley is not 100%

(i) There is always some friction between the pulley and the string(ii) The string is not weghtless.

(i) There is always some friction between the pulley and the string
(ii) The string is not weghtless.