It would depend on how the material was “dropped.” The height of the drop would be more important than the weight. If you just dumped a ton of ping pong balls, all separate, on me, I doubt it would affect me at all. As the weight would lose it’s relevance to the height of each individual ball.
If you took a ton of ping pong balls, and put them in a container, now you’re talking deadly.
I am reminded of the people who get found dead under stacks of old news papers. Each page is pretty harmless, but the accumulated mass of many make it heavy.
I suppose, the argument could be made, that any material would be the same. Even lead is made of single atoms, and molecules combined. It’s just that they are more densely packed, than most other things…
Now. If you’re talking about a ton of feathers, there “will” be a survivable distribution of the 1 ton (or the equally effective half ton.) Somewhere, there is a red line. It would differ depending on whom it was dropped on…
So… You could take a water bottle, and fill it with Spanish moss, and drop it out of an airplane. The velocity it gathers, as it falls, should be sufficient to drill into some poor bastard’s head.
In matters of death by having something dropped on you, the height, is really the most important variable. Right?.... Or, the speed of the object/material when it contacts human tissue/bone…