"Modulus" (and/or "Young's Modulus") is a means of calculating both tensile strength and elasticity in various materials and structures. Among other things it takes into account not only the material used (in the case of a truck frame, what grade of steel), but also the thickness, the shape of the beams, and any crossmembers."

That's kinda like Stress/Strain applications, right? where you can graph the stress and strain to show two curves, one tensile strength and one elasticity, and plot how much force is needed to break a material. We study that same topic when dealing with rock structures (I'm an Enviro Geology major at Northeastern) and you can plot how much force a rock can take before it breaks down, as well as the elasticity of a rock and how much it can "bend" under stress before shearing. Interesting stuff.

Ryan