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JAMB Physics 2002 Question 2

Question 2

Friction

The effect of a particle in a fluid attaining its terminal velocity is that the

  1. A.weight is equal to the retarding force
  2. B.acceleration is maximum
  3. C.buoyancy force is more than the weight of the fluid displaced
  4. D.buoyancy force is equal to the viscous retarding force.
Show the answer and explanation

Answer: A (weight is equal to the retarding force)

Explanation

At terminal velocity the forces balance: the weight equals the total upward (retarding) force, so the acceleration is zero.