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Based on our graph, it states that the theoretical centripetal force is not proportional to the radius of the rubber stoppers motion. Since Fc=m.a and a=4π²r/T² then Fc=m (4π²r/T²), basically we are only graphing the Fc’s relationship to r. This statement can only be held true if the mass is constant, and T is constant. In this case, though m stays constant, T does not, and that is why the graph does not display a direct proportionality between Fc and r.