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Old Oct 6th 2009, 10:45 PM   #1
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Uniform Circular Motion

I have a bob attached to a hanger by a string.
I also have a spring attached to the bob and a central shaft.
(The spring is stretched slightly upward.)

I have found the radial acceleration and speed of the bob after doing a number of revolutions over a time period.

How would I find the radial force? I am also trying to solve for tension.

This is what I did:

T=W Tension=weight of the bob
W=mg I got stuck here.

Or is it like this: T=mg(v^2/rg)?

Any help is much appreciated!
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Old Oct 7th 2009, 11:42 AM   #2
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I believe I have found the answer.
Basic spring apparatus:
T-mg=0 so T=mg where "m" is the added mass. Tension is equal to the static force needed to stretch the spring.

F=ma where "m" is the mass of the bob without added mass.
this is will give us the radial force.
Radial force is the dynamic force needed to stretch the spring.
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Old Oct 7th 2009, 09:48 PM   #3
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you're right
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