The influence of partially ionised plasma effects on the observed dynamics of the solar atmosphere is a subject being given huge amount of attention in recent years. Here we present results from our studies into partially ionised plasma dynamics using the (PIP) code, a code designed to study partially ionised plasma by solving the ion and neutral parts separately. The two main studies of focus are 1) the formation and development of reconnection slow shocks and 2) the linear and nonlinear development of the magnetic Kelvin-Helmholtz instability, both in a partially ionised plasma. In the first study we found that a quasi-steady state develops, but the structure of the shock front was highly dependent on inflow Mach number. In the second study, the nonlinear evolution gives rise to the formation of ion-neutral centrifuges, flinging the neutrals from the vortex centre. These studies highlight how partial ionisation can change even the most basic of physical processes like shocks and votex formation, making it of great importance to understand the nature of dynamics in the atmosphere of any cool star.