DIFFERENCE BETWEEN NEWTONIAN AND NON-NEWTONIAN FLUIDS

Summary

This video explores Newton's law of viscosity and its distinction between Newtonian and non-Newtonian fluids. Newtonian fluids like water and honey maintain a constant viscosity regardless of force, while non-Newtonian fluids, such as ketchup and toothpaste, change their viscosity when force is applied. The video demonstrates this concept with a fun experiment using cornstarch and water to create Oobleck, a non-Newtonian fluid. When force is applied to Oobleck, it solidifies, showcasing its ability to become bulletproof. The video highlights the key differences between fluid types and how viscosity is affected by force.

Takeaways

• 😀 Newton's law of viscosity applies only to Newtonian fluids, which maintain a consistent viscosity regardless of the applied force.
• 😀 Viscosity is a fluid's thickness, determining how easily it flows. Water is less viscous than honey.
• 😀 Newtonian fluids, like water and honey, have low viscosity and behave predictably under varying forces.
• 😀 Non-Newtonian fluids, like toothpaste and ketchup, change their viscosity when force or pressure is applied.
• 😀 Oobleck, a non-Newtonian fluid, behaves like a solid when struck but returns to a liquid state when left undisturbed.
• 😀 Non-Newtonian fluids can resist penetration under force, as shown by the Oobleck experiment.
• 😀 To make Oobleck, mix 1.5 cups of cornstarch with 1 cup of water until the mixture is hard to stir but not too dry.
• 😀 Food coloring can be added to Oobleck for a colorful effect while still demonstrating its unique properties.
• 😀 Punching Oobleck results in the mixture solidifying due to the high viscosity under pressure.
• 😀 Non-Newtonian fluids, such as Oobleck, act like liquids under normal conditions but become more solid when pressure is applied.

Q & A

What is the difference between Newtonian and non-Newtonian fluids?

Newtonian fluids, like water and honey, have a constant viscosity that does not change regardless of the applied force. Non-Newtonian fluids, like ketchup and Oobleck, change their viscosity depending on the force or pressure applied.

What does viscosity refer to in the context of fluids?

Viscosity refers to the thickness or resistance to flow of a fluid. It determines how easily the fluid moves; higher viscosity means the fluid is thicker and flows more slowly.

Can you provide an example of a Newtonian fluid and describe its behavior?

Water is an example of a Newtonian fluid. Its viscosity remains constant no matter how much force is applied, meaning it flows the same regardless of external conditions.

What happens when you apply force to a Newtonian fluid like water?

When force is applied to a Newtonian fluid like water, it flows around you and does not resist your movement. For example, if you try to stand on water, you would pass through it as it moves easily.

What happens to non-Newtonian fluids when force is applied?

Non-Newtonian fluids, such as Oobleck, change their viscosity when force is applied. They become more solid or resistant to movement under pressure but return to a liquid state once the force is removed.

How can you make Oobleck, and what does it demonstrate about viscosity?

To make Oobleck, mix cornstarch and water in a bowl until the mixture is difficult to stir but not too dry. Oobleck demonstrates that when force is applied, the viscosity increases, causing it to behave like a solid under pressure and a liquid when the pressure is released.

Why does Oobleck appear to solidify when punched or hit?

Oobleck solidifies when force is applied because it is a non-Newtonian fluid. The increased pressure causes its viscosity to rise, making it resist movement, similar to a solid.

Is Oobleck truly bulletproof, as mentioned in the script?

Yes, Oobleck behaves in a way that can absorb and resist impact, which is why it is described as bulletproof in the script. The solidifying property under force helps protect against certain impacts.

What are some common everyday examples of non-Newtonian fluids?

Everyday examples of non-Newtonian fluids include toothpaste, ketchup, and Oobleck. These fluids change their viscosity based on the pressure or force applied to them.

How does the viscosity of a non-Newtonian fluid change with force?

When force is applied to a non-Newtonian fluid, its viscosity increases, making the fluid temporarily behave like a solid. Once the force is removed, it returns to its liquid state with lower viscosity.