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JAMB Physics 2008 Question 3

Question 3

Scalars and Vectors

The resultant of two forces 12 N and 5 N is 13 N. What is the angle between the two forces?

  1. A.0°
  2. B.45°
  3. C.90°
  4. D.180°
Show the answer and explanation

Answer: C (90°)

Explanation

122 + 52 = 144 + 25 = 169 = 132, so the forces form a right-angled triangle (Pythagoras): they act at 90° to each other.