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JAMB Physics 2005 Question 25

Question 25

Equilibrium of Forces

The value of F in the figure above when in equilibrium is

Diagram for this question
  1. A.10 N.
  2. B.12 N.
  3. C.27 N.
  4. D.20 N.
Show the answer and explanation

Answer: D (20 N.)

Explanation

10 N and 17 N are at right angles, so their resultant is √(102 + 172) ≈ 20 N. F must be equal and opposite to this resultant: about 20 N.