Thanks for showing the real life practical example. It helped a lot to understand well the concept of Newtonian fluids, Non-newtonian fluids, Shear thinning and Shear thickening.
Understanding non-newtonian fluids was tough for me. My lecturers were doing the most recording hour long lectures filled with confusing explanations, and you're here with a 3 minute, clear cut explanation with a golfball and ketchup. Many thanks and max respect Nathan 💪
Non Newtonian isn’t just Shear Thickening (Oobleck) but can also be Shear Thinning (like Ketchup), where a solid-like substance turns into liquid-like when force is applied (or rather, viscosity decreases drastically with force). You can also have Bingham plastics which require some amount of shear stress (some force) before viscosity starts changing, like toothpaste! Those are other common examples of non-Newtonian fluids
Thanks for the real life examples, it was hard for me to understand dilatant fluids, now that I've seen the white fluid in the video, I can see that it exists haha
Why is the ball bouncing off of the ketchup at 1:15? Looks like shear thickening fluid to me ;) Did you put starch in the Ketchup at some time after filming the shear thinning post, and cut the Video in the wrong order ;)
The ketchup is ordinary but it becomes more slippery once you apply shear stress to it. So it's a thick syrup when it's stationary but once you apply a shear stress such as squeezing it, it become slippery, hence it's viscosity decreases. Viscosity can be explained as how slippery the layers of a material are in reference to each other. Newtonian fluids stay the same; their viscosity does not change, no matter how you stress the material viscosity is constant. But ketchup in this case is called a shear-thinning fluid, apply a stress to it, it's less viscous.
