3.2.1. Newton's Laws of Viscosities

Try these first

1. 1.

   Define viscosity.

   Hint

   Think of what makes some fluids thicker than others.

2. 2.

   What does the no-slip condition refer to?

   Hint

   Consider how fluids behave when in contact with surfaces.

3. 3.

   What is viscosity?

   • A measure of temperature
   • Resistance to flow
   • Mass of a fluid

   Hint

   Think about thick vs. thin fluids.

4. 4.

   True or False: The no-slip condition means fluid travels with the same speed as the surface.

   • True
   • False

   Hint

   Visualize a fluid layer sticking to a surface.

5. 5.

   If a fluid has a viscosity of 0.75 Pa.s and a shear rate of 30 s^-1, calculate the shear stress.

   Hint

   Remember the formula relating viscosity to shear stress and shear rate.

6. 6.

   Discuss how viscosity changes with temperature, providing both theoretical background and practical examples.

   Hint

   Think about how heating affects fluid properties in a kitchen.