I Claude Naiver work on Navier-Stokes equations

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Claude Navier's two works on fluid motion, "Sur les lois des mouvements des fluides, en ayant égard à l’adhésion des molecules" (memoire 1) and "Sur Les Lois du Mouvement des Fluides" (memoire 2), were both written in 1821, with the second published in 1822. Memoire 1 is significant for introducing the viscous term μ∇²u, which is crucial for understanding fluid dynamics. However, there is difficulty in locating a PDF of memoire 1, as it appears to be unpublished. The formulation discussed in the thread aligns with Navier's contributions in memoire 1, although the exact notation may differ. Overall, these works laid foundational principles for the Navier-Stokes equations.
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I am interested what are main differences/news in two Claude Navier works "Sur les lois des mouvements des fluides, en ayant égard à l’adhésion des molecules"- memoire 1 and "Sur Les Lois du Mouvement des Fluides" memoire-2?

Are both works written(not published) in 1821? Does memoire 1 introduced visocus term μ∇2u?

I cant find pdf of memoire 1..

"Sur Les Lois du Mouvement des Fluides"
https://perso.crans.org/epalle/M2/EC/Histoire/Navier1822MemoireSurLesLoisDuMouvementDesFluides.pdf

Is this formulation(dont have to be same notation) what Navier introduced in 1821 memoire 1?
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Thread 'Why higher speeds need more power if backward force is the same?'

Thread 'Why higher speeds need more power if backward force is the same?'

Power = Force v Speed Power of my horse = 104kgx9.81m/s^2 x 0.732m/s = 1HP =746W Force/tension in rope stay the same if horse run at 0.73m/s or at 15m/s, so why then horse need to be more powerfull to pull at higher speed even if backward force at him(rope tension) stay the same? I understand that if I increase weight, it is hrader for horse to pull at higher speed because now is backward force increased, but don't understand why is harder to pull at higher speed if weight(backward force)...
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