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JAMB Physics 2005 Question 27

Question 27

Simple Machines

In an ideal wheel and axle system, R stands for the radius of the wheel and r is the radius of the axle. The mechanical advantage is

  1. A.R/r.
  2. B.(r/R)2.
  3. C.r/R.
  4. D.(R/r)2.
Show the answer and explanation

Answer: A (R/r.)

Explanation

For an ideal machine MA = VR, and the velocity ratio of a wheel and axle is R/r.