But you have to calculate load relative to strency relative to weight.

How many WTC7s could you stack on top of WTC7? How many cans could you stack on top of a can?

If I take an entire WTC7, hold it ten feet above WTC7, and then drop it, I think you would agree that both building would be destroyed.

But if I take a can, hold it above another can, and drop it, then it just bounces off.

It's the square-cube law. Strength is proportional to the cross-sectional area (the square of the linear dimension, like height or width), the weight is proportional to the volume (the cube).

So to simulate the equivalent weight (and hence dynamic force, once it's moving), you need to multiply by the ratio between the height of the can, and the height of the building. Then you need to add that to the can, and damage it.

If you want to simulate a dynamic load then you need to make the dynamic load proportional to the strength, which is why you need more weight, like adding a sledgehammer.

Scale.