Question
A lead ball is placed on the surface of viscous oil and released.
i) State the three forces acting on the ball as it falls through the oil
ii) State which force varies during the fall and explain why.
iii) Sketch a graph showing the variation of velocity of the ball with the time from the moment it was released.
iv) From the above graph in (iii) mark the terminal velocity.
v) State the necessary condition to attain terminal velocity in part (IV).
i) State the three forces acting on the ball as it falls through the oil
ii) State which force varies during the fall and explain why.
iii) Sketch a graph showing the variation of velocity of the ball with the time from the moment it was released.
iv) From the above graph in (iii) mark the terminal velocity.
v) State the necessary condition to attain terminal velocity in part (IV).
Answer
(i)
- Viscous drag
- Upthrust
- Weight
(ii) Friction force - this increases as the speed increases
iv)
(check the part highlighted green and marked (IV) on the diagram above)
v) The weight = viscous drag + upthrust
- Viscous drag
- Upthrust
- Weight
(ii) Friction force - this increases as the speed increases
iv)
(check the part highlighted green and marked (IV) on the diagram above)
v) The weight = viscous drag + upthrust
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