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NASA Thrust Equation gets destroyed.
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In accordance with industry accepted best practices we ask that users limit their copy / paste of copyrighted material to the relevant portions of the article you wish to discuss and no more than 50% of the source material, provide a link back to the original article and provide your original comments / criticism in your post with the article.
[quote:syncro:MV8zOTg5OTIyXzcyMzYwMjA3Xzk5NzAwNjQx] [quote:Anonymous Coward 77456542:MV8zOTg5OTIyXzcyMzU5ODgzXzYxRkJGOERD] [quote:syncro:MV8zOTg5OTIyXzcyMzU5NjMyX0ZGOTYzQzhC] [quote:Anonymous Coward 77456453:MV8zOTg5OTIyXzcyMzU5NTQ4XzUyNDRGRDBC] [quote:syncro:MV8zOTg5OTIyXzcyMzU5Mjg3XzZCMDFCOTEz] [quote:Anonymous Coward 77441821:MV8zOTg5OTIyXzcyMzU4NTYwX0Q2MTU3MERF] [quote:syncro:MV8zOTg5OTIyXzcyMzE5ODgxXzdBNzUzRjMw] [quote:Anonymous Coward 77246760:MV8zOTg5OTIyXzcyMzE4ODAyXzkzMTk4M0U3] [quote:syncro:MV8zOTg5OTIyXzcyMzE4NjEzX0Y3OUJBRjNB] [quote:Anonymous Coward 77447003:MV8zOTg5OTIyXzcyMzExMjg5X0JDOEQxQTNC] [quote:syncro:MV8zOTg5OTIyXzcyMzA4NDQ4XzIzREE3RjI5] [quote:Anonymous Coward 77446242:MV8zOTg5OTIyXzcyMzA3ODYwXzRFNEU3Q0FC] [quote:syncro:MV8zOTg5OTIyXzcyMzA3NTEyX0U3RDkxODEz] [quote:Anonymous Coward 54214626:MV8zOTg5OTIyXzcyMzA1MTYyXzU5OEVFODM=] Why don’t you point out the misunderstanding? [/quote] The vacuum cleaner provides an external source of flow going through two holes in the pipe. Why should there be a force on the pipe as would happen if gas contained inside it was expelled from one end? These are entirely different systems. The one example has no bearing on the other. Similarly, your conclusion is incorrect with the equations. Velocity is inherent to both mass flow rate and volumetric flow rate. But I don't see how this has anything to do with your vacuum cleaner example and conclusion. Force is proportional to mass flow rate, yes. And? There is nothing here. [/quote] The vacuum cleaner simply creates low pressure, that is all. https://www.quora.com/What-is-the-physics-behind-vacuum-cleaners The equation stated that there is force due to mass flow rate exiting a pipe. There is flow rate exiting the pipe. Where is the force observed? [/quote] Air is moving due to difference in pressure caused by the vacuum cleaner. We have mass and acceleration, force. [/quote] The acceleration caused by pressure differential is pressure gradient force, not because the rocket pushes it out. Just like gravity, it doesn’t need to push off anything. https://en.m.wikipedia.org/wiki/Pressure-gradient_force [/quote] Pressure difference is how the rocket pushes it out, and how the vacuum cleaner lifts, and how wings and propellers lift. Newton's third law applies to all of them and to gravity. [/quote] That’s like saying when you spill a cup of water by turning it upside down there is an opposite reaction on the cup [/quote] ? Water pulls on the earth as the earth pulls on it. Mass attracts mass with gravity. [/quote] Ok so no opposite reaction on the cup. Just like pressure gradient force [/quote] You guys are getting hung up on pressure gradient force which is a mechanism of thrust. The point is mass is being expelled in a direction and conservation of momentum applies. [/quote] This shows that there is no equal and opposite force from gas movement due to pressure gradient force. [youtube]https://www.youtube.com/watch?v=AubIFUsq7Ss[/youtube] Where your proof? [/quote] The misunderstandings in this video have been addressed over and over in these threads. It is wrong. Newton's third law and conservation of momentum applies to gravity, buoyancy, and pressure gradient force. It's just the creator of the video can't correctly identify them. [/quote] Where is it addressed? Where is the equal and opposite reaction from movement due to gravity, buoyancy And pressure gradient force? You keep saying you have addressed the issue but you haven’t [/quote] Aren't you the one that started a thread on that video? Look in the thread. No matter what is said (again), you would still say it wasn't addressed. Anyway, with gravity, the object and the earth are each exerting a force of gravity on the other. With buoyancy, weight is transferred to the object floating up from the water it was displacing. It is correct no external change in weight should show on the scale. Pressure gradient force can cause movement of a fluid mass having momentum which is conserved meaning that momentum will be transferred to another mass in contact, like a rocket. [/quote]
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