koobas.hobune.stream
Platform should bend when object falls
how to make a platform lower its position a little when a heavy object falls on it (may be the pics make it more clear) 
You might want to add some details of what exactly you are trying to do...
There are plenty of beginner level tutorials and videos out there that $$anonymous$$ch pretty much exctly how to do something like that... That is, if by "this" you mean boxes that collide to eachother. Its pretty hard to guess what you are trying to achieve by looking at 2 still images. :/
