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Message Subject
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NASA Thrust Equation gets destroyed.
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Poster Handle
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oniongrass |
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Your problem is that you're thinking of force.
F = ma is what Newton said. So one could conclude that with no external force, there's no acceleration. But he was wrong in the case of masses that change. That conclusion would be wrong.
Actually it's
F = dp/dt = ma + v dm/dt
so with no external force, momentum is conserved. And that's why rockets work. Because of the nonzero v dm/dt term.
Quoting: oniongrass So Newton was wrong? Do you have any evidence of this? Quoting: Anonymous Coward 77431166 Yeah, here are two proofs. (1) Look at any modern physics textbook that deals with rocketry. Or just look up "conservation of momentum" and see that it's considered a fundamental principle of physics. (2) Rockets work. Quoting: oniongrass Dude that’s not proof Quoting: Anonymous Coward 77001174 I cannot force you to understand. The physics and engineering professions will be OK without your contributions. Our loss is gender studies' gain.
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