If you design a bridge, you want it to stay UP -- unlike this one:
On the other hand, if you are part of a demolition team, you want to figure out how to make a building come DOWN -- unlike this one:
The study of the stability of big structures involves some pretty basic physics. Let's start with the conditions of static equilibrium. Keep in mind that, even though all the underlying physics is the same, there are several ways to approach this topic: engineers may use different language, and different symbols, than physicists.
Copyright © Michael Richmond. This work is licensed under a Creative Commons License.