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f1_mud - Lecture F1 Mud Intro Concepts Denitions(40...

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Lecture F1 Mud: Intro Concepts & Definitions (40 respondents) 1. Explain PRS #1 (1 student) For a fluids situation to be Hydrodynamic or Aerodynamic in nature, the fluid must be moving relative to an object. In the PRS question, the water does not move past the buoy. So that’s an example of Hydrostatics. 2. Why is p = lim F n / A , and not just F/A ? (1 student) This is just notation convention. The definition is similar to that of a derivative, where A becomes dA in the limit. Later in the course we will write dF n = p dA when integrating all the pressure forces on a wing. 3. If the observer frame changes, wouldn’t p ( x, y, z, t ) be different functions? (6 students) Very good question. I think I was unclear on what I meant by “same” or “different”, both on the PRS question and in the discussion. Yes, the two observers will see different p ( t ) time traces at each observer’s origin ( x, y, z ) = (0 , 0 , 0), for example. But at the instant when the two origins cooincide (obesrvers are momentarily on top of each other), the
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