Lesson 4, part 2: Cauchy's equation of momentum

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This part of the lesson on equations of motion starts from Newton's second law to derive the most general statement of momentum conservation in a continuum fluid: Cauchy's momentum equation.
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Amazing explanation, very intuitive. Thanks a lot!

chaoticvarun
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I have seen videos of this derivation before nothing come close to this, simplified to the core. thank you, Dr. Bart,

busythato
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Absolutely amazing video! Really helped me alot! Thank you!

cakefactoryy
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Hi Dr. Bart, thank you for this video - the derivation is easy to absorb. I had a question regarding 8:02 of the video - why are we introducing stress imbalances in the opposite faces of the unit volume? I understood why an imbalance was introduced in your mass continuity derivation video due to mass accumulation in the unit volume or small mass amounts escaping through the other unit volume faces, but since the Cauchy stress tensor is symmetric, how can there be an imbalance?

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