## Fundamentals of Physics Extended (10th Edition)

The equation to guide the thinking in this question is: $F_{c}$=Mass$\times$($Velocity^{2}$/Radius) Mass and velocity are held constant in this experiment. Radius is inversely related to centripetal force, so as radius increases centripetal force decreases. Arch 4 has the smallest radius(R), arches 1,2 and 3 all have the next greatest radius(2R), and arch 5 has the biggest radius of them all (3R).