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JAMB Physics 2013 Question 12

Question 12

Simple Machines

What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?

  1. A.80N.
  2. B.90N.
  3. C.100N.
  4. D.120N.
Show the answer and explanation

Answer: C (100N.)

Explanation

VR = effort arm ÷ load arm = 2. MA = 0.9 × 2 = 1.8. Effort = 180 ÷ 1.8 = 100 N.