16.1.1. Force due to Viscosity (Friction)

Try these first

1. 1.

   What is shear stress?

   Hint

   Think about forces acting along surfaces.

2. 2.

   What does dynamic viscosity measure?

   Hint

   It involves fluid friction.

3. 3.

   What defines shear stress in a fluid?

   • Force per unit area acting perpendicular
   • Force per unit area acting parallel
   • Density of the fluid

   Hint

   Remember how forces act on surfaces.

4. 4.

   True or False: Reynolds number is a measure of fluid density.

   • True
   • False

   Hint

   Think about what Reynolds number compares.

5. 5.

   Calculate the drag force on a prototype vehicle if the drag coefficient is 0.45, frontal area 2.5 m², and velocity 30 m/s.

   Hint

   What does each term in the equation represent?

6. 6.

   Discuss how to optimize a vehicle's shape to reduce drag based on aerodynamic principles derived from viscosity concepts.

   Hint

   Use concepts of laminar vs. turbulent flow for optimization.