Physics Help Forum Uniform Circular Motion

 Periodic and Circular Motion Periodic and Circular Motion Physics Help Forum

 Oct 6th 2009, 11:45 PM #1 Junior Member   Join Date: Sep 2009 Posts: 4 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!
 Oct 7th 2009, 12:42 PM #2 Junior Member   Join Date: Sep 2009 Posts: 4 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.
 Oct 7th 2009, 10:48 PM #3 Senior Member   Join Date: Apr 2008 Location: HK Posts: 886 you're right __________________ Good results were achieved and the new task is to become a good doctor.

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