Klumpfot said:
Miss G. said:
Heronblade said:
Are you really gonna nitpick the nature of the fictional
extraterrestrial metal/element, Vibranium, for not following real-universe laws of physics? Marvel's Universe, Marvel's rules, which for the kind of Vibranium in Cap's shield goes; it has the ability to absorb all vibrations in the vicinity as well as kinetic energy directed at it. The energy absorbed is stored within the bonds between the molecules that make up the substance. As a result, the more energy vibranium absorbs the tougher it becomes, however, there is a limit. Then there's the "proto-adamantium" (unique to the shield), that's mixed in as well, which is slightly different than true adamantium in that it's stronger than the latter, though both are nearly indestructible (and also completely fictional).
Is there any explanation as to how Captain America
moves the shield, if it is impossible to impart kinetic energy on it? Is it only the front that is reflective? I'm genuinely curious!
OT: I'm not sure. The most overpowered being from comics I can think of is Dr. Manhattan, and he was still a compelling character, in my opinion.
Consider another physics (at least Newtonian physics)-defying material: cornstarch. Cornstarch resists impact in direct proportion to the force being applied; the stronger the applied force, the greater resistance it provides. Conversely, weaker, low-energy impacts pass through cornstarch with ease. Cap's vibranium shield is similar in nature, resisting bomb blasts and super-powered impacts with ease, but still capable of being tossed around by what is essentially an Olympic-class discus thrower. (Yes, theoretically, low-energy forces could pass through vibranium, but the threshold is such that anything low enough energy to do so would hardly be any threat; simply deflected and blocked outright).
Vector and angular momentum play a big part in this too. Notice that Cap always throws the shield horizontally, like a frisbee, but blocks using the shield's broad side. "Naturally," you might think, "considering that's how a shield (and frisbee) is supposed to work", but throwing the shield horizontally does more than allow it to cut through the air and generate lift with its face. The horizontal posture changes the vibranium's resistance vector so it is perpendicular to the ground, thus stabilizing it in flight, as opposed to stopping it cold. This would increase the aerodynamic lift while simultaneously counteracting it perfectly for sustained, level flight and extreme resistance to forced changes in elevation as long as the shield is moving fast enough... sort of like an airfoil spoiler on a sports car. Throwing the shield
accurately, with sufficient force to do the damage it's capable of, and on sufficient trajectory so ricochets will return it to Cap eventually, is a whole other can of worms... something, as Moviebob pointed out recently [http://www.escapistmagazine.com/articles/view/columns/moviebob/10705-Lets-Watch-the-Captain-America-The-Winter-Soldier-Trailer.3#], is Marvel canon as "pretty much only Cap can do it".
In answer to the other question, "why doesn't Cap still break his arm?" is mostly in the nature of Vibranium. Vibranium reacts to impact such that the energy is transmitted
across the shield, as opposed to being absorbed into or transmitted through the shield. Ordinary shields accomplish this with angular deflection (which Cap's shield also has thanks to its rounded shape). Vibranium, like cornstarch or even ordinary water, generates vibration (hence the name), or waveform motion on impact, causing the shield to wobble and hum instead of permanently deform... like ringing a bell or bouncing something off of a jell-o mold. Now, this vibration, in magnitudes such as Cap absorbs on a regular basis, would still shatter a normal human arm (even more spectacularly than the original impact would, I might add). But, Cap has two added benefits: his superhuman strength (with implied increased density and resistance to impact) and his enhanced recovery abilities. Cap may not be able to regenerate his arm being cut off, like some other Marvel characters who shall remain nameless (because he preferred it that way, until recently), but his enhanced recovery should be more than capable of healing through a thousand tiny cuts.
PS: Yes, I
made up deduced most of that. If there's a more official source or answer, I'd love to see it too.