Skip Navigation
You are viewing an older version of this Concept. Go to the latest version.

Newton's Third Law

For every action, there is an equal and opposite reaction.

Atoms Practice
Estimated6 minsto complete
Practice Newton's Third Law
This indicates how strong in your memory this concept is
Estimated6 minsto complete
Practice Now
Turn In
Non-newtonian Fluids

Non-newtonian Fluids

Credit: Rory MacLeod
Source: http://www.flickr.com/photos/38775064@N05/5393823764/
License: CC BY-NC 3.0

Non-Newtonian fluids are those that exhibit flow properties that are different than Newtonian fluids. These types of fluids typically have a viscosity which depends upon the shear rate of the fluid.

News You Can Use

Credit: Daniel Christensen
Source: http://en.wikipedia.org/wiki/File:Corn_speaker.jpg
License: CC BY-NC 3.0

Non-Newtonian fluid thickens as force is applied from the sounds waves of the sub-woofer [Figure2]

  • While most fluids show little resistance when a sheer stress is applied, non-Newtonian fluids provide a resistance that is proportional to the sheer stress applied. This is a result of the particles that are held in suspension in the fluid. As a result, the liquid behaves more like a solid than a liquid when the shear rate is increased. The shear stress is defined as the ratio of the shear force to the area it is applied too.

\begin{align*}Shear \ Stress=\frac{F_s}{A}\end{align*}

  • The behavior of non-Newtonian fluids is dependent upon many parameters such as particle size, particle distribution and particle volume fraction. When a sufficient shear stress is applied to a non-Newtonian fluid the particles inside jam up like too many people trying to get through a single doorway. This jam up causes an increase in the viscosity of the fluid.
  • Chances are you used or played with non-Newtonian fluids but never realized it. Everyday examples include: silly putty, corn starch and water and even some brake pads. Recent advancements in the study of non-Newtonian fluids even suggest that it could be used as a form of body armor in the near future.
  • Watch the Time Warp crew video Non-Newtonian fluids in slow motion: http://www.youtube.com/watch?v=S5SGiwS5L6I

Explore More

Using the information provided above, answer the following questions.

  1. Would ketchup be a non-Newtonian fluid? Why?
  2. In both of the videos above, why did the hosts have to move quickly across the surface of the liquid?
  3. Would quicksand be a Newtonian or a non-Newtonian fluid?

Notes/Highlights Having trouble? Report an issue.

Color Highlighted Text Notes
Show More

Image Attributions

  1. [1]^ Credit: Rory MacLeod; Source: http://www.flickr.com/photos/38775064@N05/5393823764/; License: CC BY-NC 3.0
  2. [2]^ Credit: Daniel Christensen; Source: http://en.wikipedia.org/wiki/File:Corn_speaker.jpg; License: CC BY-NC 3.0

Explore More

Sign in to explore more, including practice questions and solutions for Newton's Third Law.
Please wait...
Please wait...