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 Form 3 Physics Newton's laws of motion questions and answers

Figure 8 shows the graph of velocity against time for a small steel ball falling in a viscous liquid.
(i) Describe the motion of the steel ball as represented by part OA.
(ii) Explain why the velocity between A and B is constant.

 (5m 53s)
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Answer Text:
(i)- The steel ball accelerates towards the bottom because its weight is greater than the sum of upward forces.
(ii)- The sum of upward forces (viscosity+upward) becomes equal to weight and the resultant force is zero. The ball therefore attains a constant