The slide

This is a very simple experiment, as you will run it. the first block will fall on the slide and hit the second. 
I have used some special settings (Delta t to 3 instead of 2, Fluidfriction to 998 intead of 999 (to prevent a molecular explosion due to the high deltaT)  :-) and some added gravity to make this simulation a little bit faster and more enteraining. 
After the action stopped you can still get some of the object by  selecting some atoms and applying a force (or a speed.. but be careful with this) so to lift them and make them fall of the slide again.
(see ACTIONS/INTERACT)