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JAMB Physics 2001 Question 6

Question 6

Scalars and Vectors

The resultant of two forces acting on an object is maximum if the angle between them is

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

Answer: B (0°)

Explanation

R2 = F12 + F22 + 2F1F2 cos θ is largest when cos θ = 1, i.e. θ = 0°: the forces act in the same direction and simply add.