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JAMB Physics 2009 Question 13

Question 13

Friction

The terminal velocity of a ball-bearing falling through a viscous fluid is reached when the

  1. A.upthrust is equal to the weight of the ball.
  2. B.ball accelerates uniformly.
  3. C.upthrust is equal to the velocity of the ball.
  4. D.velocity is unform.
Show the answer and explanation

Answer: D (velocity is unform.)

Explanation

At terminal velocity the weight is balanced by upthrust plus viscous drag, so the resultant force is zero and the ball falls at a constant (uniform) velocity.