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Unformatted text preview: Lecture F7 Mud: Momentum Flow, Momentum Conservation (34 respondents) 1. Can you give some examples? (3 students) Besides the PRS question, there wasnt time for other examples, since I wanted to cover the stuff in one organized swoop. The next lecture F9 will revisit the material, and deal mostly with applications. 2. How do you know what signs the V s should have? (1 students) If the velocity points in the direction of the x-axis, then V = V . If it points opposite to the x-axis, then V = V . 3. Unclear on the physical principles/concepts behind the equations (2 students) The main underlying concept is Newtons Law F = d ( m a V ) /dt . Because the affected mass that we are applying this equation to is moving through our control volume, we need to bring in the related concept of momentum ow to do the accounting properly. The rest is mainly math manipulation. 4. Why did dm i V i get subtracted? Seems it also gets kicked by F dt . (1 student) Actually, dm i V i...
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This note was uploaded on 01/28/2012 for the course AERO 16.01 taught by Professor Markdrela during the Fall '05 term at MIT.
- Fall '05