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The discovery may help scientists to better understand the behaviors of other non-Newtonian fluids such as quicksand, wet concrete, Silly Putty, and the viscous material that gives your car all-wheel drive.
Engineers take advantage of this behavior, also called shear thickening , in viscous couplings on four-wheel-drive cars. In their experiment, Waitukaitis and physicist Heinrich Jaeger filled a tub with water and cornstarch, then used high-speed videography to watch as they slammed a metal rod into the mixture.
The video below shows the goop solidifying around the impact site of the rod. Instead of penetrating the surface of the mixture, the rod pushes it down, forming a bowl-like depression.
And just for the fun of it, here's a video showing a bowling ball bouncing off of the goop:. The trouble with studying this weird stuff is that it's opaque. So the researchers used X-ray imaging to monitor what happens inside the goop during impact. As the rod smashed into the mixture, they saw that the water between the cornstarch particles seemed to flow away from the site of impact, leaving behind a very dense patch of particles.
The further the rod was pushed, the denser those particles became. Shelley says that having a better understanding of these types of fluids could lead to fundamentally new applications. Jamie then created a Non-Newtonian fluid from a mixture of water and corn starch, which made the water solid enough for Adam to run across unaided. However, it is unlikely that ninjas had access to large amounts of corn starch, so the myth was busted.
To start off, Jamie fired arrows blunted with tennis balls while Adam tried to catch them. Though it took several tries, Adam did manage to catch the arrows flying through the air. However, these arrows were only moving at a third of the speed as a normal arrow.
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