Give two reasons why the efficiency of a single movable pulley is not $100 %$ . $[2 marks]$

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Solution

The single movable is not $100 %$ because:

of the mass of pulleys and the string, they provide resistance against the effort.

of loss of energy in pulley bearings because of friction.

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

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

a) What is single movable pulley?
b) What is its mechanical advantage in an ideal case?

c) If the effort moves by a distance x upwards, by what height is the load raised?
d) Give two reasons why its efficiency is not $100 %$ in practice.

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.

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Give two reasons why the efficiency of a single movable pulley is not 100%. [2 marks]

The single movable is not 100% because: of the mass of pulleys and the string, they provide resistance against the effort. of loss of energy in pulley bearings because of friction.

Give two reasons why the efficiency of a single movable pulley is not $100 %$ . $[2 marks]$

The single movable is not $100 %$ because:

of the mass of pulleys and the string, they provide resistance against the effort.

of loss of energy in pulley bearings because of friction.