Thanks for the reply;
-Yes,The + 5cm/1 gram are uncertainties
-No,Excel cannot figure out any formula
-The experiment is not a pendulum, it is rather looks like: http://www.stmary.ws/high school/physics/home/lab/Centripetal_Force_Lab.htm
Actually,I would like to just find out the relationship...
The radius is the same for all the first trials(for determining the relationship of mass and time), and the mass is also the same for all the second trials(for determining the relationship of radius and time)
We did a experiment, and the aim was to find out that relationship between mass and radius with period of time in the circular motion..Although I know the formula for centripetal force, but I am not sure about what the expression should be
The lab data :
Table 1: 1st experiment ...