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ICSE Class 10 Physics Question 20 of 27

Solved 2024 Question Paper ICSE Class 10 Physics — Question 9

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Question

Question 6(iii)

Given are two pulleys.

Given are two pulleys. ICSE 2024 Physics Solved Question Paper.

(a) Copy and complete the labelled diagram connecting the two pulleys with a tackle to obtain Velocity Ratio = 2.

(b) If Load = 48 kgf and efficiency is 80% then calculate :

  1. Mechanical Advantage.
  2. Effort needed to lift the load
Answer

(a) The diagram is given below :

The diagram is given below. ICSE 2024 Physics Solved Question Paper.

(b)

  1. Given,

Velocity Ratio = 2

Load = 48 kgf

Efficiency = 80% = 0.8

As,

Efficiency=Mechanical AdvantageVelocity Ratio⇒Mechanical Advantage=Efficiency×Velocity Ratio=0.8×2=1.6\text {Efficiency} = \dfrac {\text {Mechanical Advantage}}{\text {Velocity Ratio}}\\[1 em] ⇒ \text {Mechanical Advantage} = \text {Efficiency} \times \text {Velocity Ratio}=0.8 \times 2 = 1.6

  1. As,

Mechanical Advantage=LoadEffort⇒Effort=LoadMechanical Advantage=481.6=30 kgf\text {Mechanical Advantage} = \dfrac{\text {Load}}{\text {Effort}}\\[1 em] ⇒ \text {Effort} = \dfrac{\text {Load}}{\text {Mechanical Advantage}}= \dfrac{48}{1.6}=30 \text { kgf}