Ever played with something that's both a solid and a liquid? You've probably encountered a non-Newtonian fluid! Unlike water, whose viscosity (thickness) stays constant, these quirky substances change their viscosity under stress. Think of oobleck, the classic cornstarch and water mix. When you gently dip your hand in, it feels like a liquid. But punch it? It becomes solid!
This strange behavior is due to the fluid's structure. In oobleck, cornstarch particles are suspended in water. Applying pressure forces these particles together, creating temporary bonds and increasing resistance to flow, making it feel solid. Other examples include ketchup (which thins when shaken), paint, and even some types of quicksand. Non-Newtonian fluids aren't just fun to play with; they're used in everything from body armor to shock absorbers. So, the next time you're making oobleck, remember you're exploring some fascinating physics!
