system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU] Captain America's shield absorbed a full strength hammer smash from Thor leveling the woods around him in the first movie leaving cap unscathed, yet Ultron got knocked away by a casual hammer swing by Vision in the second movie.

The shield and Ultron are both made of vibranium, why did this happen?
gpt
Vibranium can be applied in different ways for different purposes. The difference between the solid vibranium (alloy?) frisbee and a complex machine made up of individual vibranium components was a matter of purpose. The shield was designed to be a solid plate of metal that can withstand a hit. Ultron designed his final form for mobility and sarcasm.