The steady state, two-dimensional transitional criteria between regular reflection (RR) and Mach reflection (MR) of oblique shock waves has been well understood through various studies on a stationary, two-dimensional wedge. There is, however, limited literature available on the transition criteria considering the dynamic effects of a rapidly flapping wedge. In the present study, the effect of rapid wedge rotation on RR to MR transition is investigated and is compared with the steady state transition. A second order accurate Euler solver based on unstructured finite volume method which uses AUSM to calculate convective flux is used to numerically simulate the flow. The time scales associated with the evolution of Mach stem in RR to MR transition at different rates of wedge rotation are studied. The movement of reflection/triple point for various rates of wedge rotation is also investigated. The effect of rate of rotation is examined on the shock angle at transition and also on the pressure at the reflection point. The influence of change in pivot point on the transition and on Mach stem growth rate is also examined. It is found that transition happens nearly at the same wedge angle on changing the pivot point but the Mach stem growth rate depends on the pivot point. The investigation is further done to obtain transition lines for RR to MR transition as in case of steady flows considering dynamic effects. Multiple Mach Numbers in strong reflection range are investigated and transition lines corresponding to different rotation speeds are obtained. The further studies are done to understand the effect of change in initial incidence on the transition point for the dynamic case.