Add discrete movement to Pawn

I want to move a simple Pawn object to fall from the sky upon being spawned but instead of simply crushing to floor it has to move on the Y Axis. This wouldn’t be such a big problem if I made it move continuously as one would do with a Character object but I want it to use a discrete movement.
What I mean is that it should move the same way the Tetris pieces do when they fall from the top of the grid: after X seconds, they drop down by Y centimeters and so on until they touch the floor.