Practice Linear Momentum Equations (19.2.1) - Surface Forces and Stress Tensors

Practice: Linear Momentum Equations

Lesson 19.2.1Surface Forces and Stress Tensors

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10 questions

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6 sample questions

Question 1.
Define a stress tensor in the context of fluid mechanics.
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Think of how internal forces are represented.
Question 2.
What is the difference between normal stress and shear stress?
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Consider their orientation with respect to surfaces.
3Question 3.
What is the primary purpose of a stress tensor in fluid mechanics?
- To measure pressure
- To describe internal forces
- To quantify external forces
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Think about internal versus external properties.
4Question 4.
True or False: Atmospheric pressure must always be considered in fluid flow analyses.
- True
- False
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Consider how pressure affects surface balance.
Question 5.
Consider a cylindrical tank with fluid flowing in and out. Calculate the net momentum flux if inflows are at 5 kg/s with a velocity of 2 m/s and outflows are at 3 kg/s with 1.5 m/s.
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Use the momentum equation focusing on net inflow and outflow.
Question 6.
Using Reynolds Transport Theorem, derive the momentum flux equation for a fixed control volume and discuss any assumptions.
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Explore the steady state vs. unsteady relationship in your assumptions.

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