This Video is about the varying angular velocities of the mass elements on the fly rod shaft. It shows how a fly rod representing a flexible, non rigid object / body behaves as it is rotated. See also vimeo.com/187846392
Earlier phase of rotation: the angular velocities ω of the upper mass elements are slower (!) than the lower ones. Later phase of rotation: the angular velocities ω of the upper mass elements are faster (!) than the lower ones. The fastest angular velocity shifts from the lower towards the upper mass elements meanwhile the lower mass elements decelerate.The towards the tip shifting fastest angular velocity indicates, that in association with the modification of the moment of inertia, some kinetic energy, angular momentum respectively, redistributes towards the tip too.