Terminal velocity of an object falling in a liquid (no numericals involved!)?

I'm doing a lab practical atm; I need an answer for this within about 30 minutes.


Easy 10 points for the most convenient method =p





I need to find one way to investigate the terminal speed of a ball falling through liquids of varying viscosity. We'll decide on the independent variable once we know how to identify when the ball has reached Terminal Velocity.Terminal velocity of an object falling in a liquid (no numericals involved!)?
what you want are:





1. clear tube in which to conduct the experiment.


2. calibrated ruler on the far side of the tube.


3. clock/watch used for competition with a 1/100th of a second hand.


4. camera to monitor the action.





when you see the distance the ball travels remains the same for a time period, it's at terminal velocity.


there is a problem of perspective.


possibly, for more viscus liquids, you could move the tube so that the ball remains level with the camera.


during acceleration, that could cause a problem.


at terminal velocity, it will not.





5. you might want a mirror on the far side,