19.6.2. Preparation for Next Class

Try these first

1. 1.

   Define a stress tensor.

   Hint

   Focus on the internal forces within materials.

2. 2.

   What are the two types of stresses in fluid mechanics?

   Hint

   Think about how stresses behave relative to surfaces.

3. 3.

   What does the term 'stress tensor' refer to?

   • A mathematical representation of external forces
   • A mathematical representation of internal forces
   • A type of pressure measurement

   Hint

   Think about what happens inside materials.

4. 4.

   True or False: Shear stress acts perpendicular to the surface.

   • True
   • False

   Hint

   Consider the direction of force relative to the surface.

5. 5.

   A cylindrical tank is filled with water providing a gauge pressure of 50 kPa at the bottom. Assuming the tank’s surface area is 2 m², calculate the total force exerted by the water on the bottom surface.

   Hint

   Recall the relationship between pressure, area, and force.

6. 6.

   Consider a control volume around a pipe with both inlet and outlet. If the fluid's velocity changes due to friction, describe how shear stress could be affecting the flow at different pipe sections.

   Hint

   Reflect on how viscosity plays a role in friction.