Newtonian fluid

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/newtonian-fluid

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the key feature?Constant dynamic viscosity (μ) independent of shear rate or applied stress
2. What is the related topics?Fluid dynamics, rheology, viscosity, shear stress, shear rate, Navier-Stokes equations, non-Newtonian fluids
3. Why do Newtonian fluids behave the same when I stir them faster?Because their viscosity never changes. If you double the force you apply, the flow rate also doubles, following a straight‑line relationship.
4. How is a Newtonian fluid different from a non‑Newtonian fluid like ketchup?In a Newtonian fluid, the viscosity is constant and does not change with stress. Non‑Newtonian fluids can become thicker or thinner when stirred, so their viscosity changes.

Viscous Stress: Internal forces within a fluid that resist deformation due to flow.
Strain Rate: The rate at which a fluid deforms under stress.
Dynamic Viscosity: A measure of a fluid's resistance to shear flow, constant for Newtonian fluids.