1.3.1. Newton's Law of Viscosity

Try these first

1. 1.

   What is viscosity?

   Hint

   Think about thick vs. thin fluids.

2. 2.

   What does τ represent in Newton's Law of Viscosity?

   Hint

   It's related to how fluids slide against each other.

3. 3.

   Which of the following best defines viscosity?

   • A measure of how fast a fluid flows
   • A measure of a fluid's resistance to flow
   • A measure of the density of a fluid

   Hint

   Remember how some fluids flow more easily than others.

4. 4.

   True or False: Higher dynamic viscosity leads to lower shear stress.

   • True
   • False

   Hint

   Think about the relationship described in Newton's Law of Viscosity.

5. 5.

   A fluid with a dynamic viscosity of 3 Pa·s flows through a pipe with a radius of 0.1 m. What is the shear stress if the velocity gradient is found to be 4 s^-1?

   Hint

   Use the given values in the formula directly.

6. 6.

   Discuss how changing the temperature of a fluid might affect its viscosity and provide a real-world example.

   Hint

   Think about how temperature relates to fluid movement!