Algodoo

Three spongey walls with different axle break limits.
10 newtons for green, 6 newtons for yellow, and 4 newtons for red.

I figured this would be neat for destructible models, as this can kind of emulate "decay" of materials on an impact. The materials do depend on sponginess however, but Im sure that could be mediated somehow.
I'll keep working on the idea, I guess!