Type in values for start time and end time. Choose a curve from the selection menu and click the start button. You will see the animation of a particle motion in three coordinate systems (Cartesian, Polar and Normal) along with the components of velocity and acceleration . Note that the unit vectors that define the Polar and Normal coordinate systems change whereas the unit vectors define the cartesian system do not change. With the open window, close window buttons you can open and close the animation window.