How to control velocity in a conical pendulum

AI Thread Summary
To control velocity in a conical pendulum experiment, the formula v = 2πr/T is used to calculate velocity based on radius (r) and period (T). To maintain consistent velocity while varying mass, adjustments to r and T must be made, which can be determined through trigonometry and timing measurements with a stopwatch. The mass itself does not directly factor into the velocity calculation but influences the radius and period. Since the experiment involves manual spinning, precise control may be challenging without a velocity measuring device. Understanding the relationship between these variables is key to successfully managing velocity in the experiment.
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Homework Statement


I'm doing an EPI on horizontal circular motion and for one test the independent variable is mass and I need to control the velocity by using the 2πr/T formula. So I know how to use the forumula to find an unknown but how do I use it for two unknowns (r and T). Is there a forumula with M in it that would help?. Because the r will be different for the different masses and so will the T. I'm really confusing myself now, but I guess my question is how do I control velocity in the experiment.

IV: mass, length of string
CV: velocity ...
DV: angle

P.S I'll be spinning it by hand and don't have access to a velocity measuring device (unless its an app or something)

Am I missing the point completely?

Thanks for any help you can give
 
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You use ##v=2\pi r/T## to find the velocity, not control it.
You can find r using some trigonometry and you measure T with a stopwatch.
 
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