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JAMB Physics 2001 Question 4

Question 4

Simple Machines

The diagram above is a block-and-tackle pulley system in which an effort of 80 N is used to lift a load of 240 N. The efficiency of the machine is

Diagram for this question
  1. A.60%
  2. B.50%
  3. C.40%
  4. D.33%
Show the answer and explanation

Answer: B (50%)

Explanation

There are 6 pulleys, so VR = 6. MA = 240/80 = 3. Efficiency = MA/VR × 100% = 3/6 × 100% = 50%.