On the Bernoulli's Principle 'error':
Apparently this is a very common error made by physics teachers across America.
"Newton, and his laws of motion. You can easily-and correctly-explain why airplanes fly from the first principles. No need to resort to Bernoulli...Airplanes fly because the wing makes the air go down, so the airplane goes up. Action-reaction. Newton's Third law. How hard is that to understand?"
He says that:
I'm not entirely sure this is true. The book doesn't give any math; just this explanation.
[Bernoulli] was created-really pulled out of a hat- around World War II when the airplane was becoming popular and people wanted a simple explanation. But in reality it takes more time to explain the complicated workings of Bernoulli's principle than it does the simple laws of Newton.
One of my questions is: How does an airplane's wing make air go down?
It doesn't really make sense to me. I have with me a physics textbook I permanantly 'borrowed' from my 8th grade science teacher, and in it it says:
It seems that my textbook's explanation makes a bit more sense, but Flatow's also makes sense (with the exception of the 'air being pushed down by the wing'.
The air above the wing must be moving faster. According to Bernoulli's Principle, then, the air above the wing exerts less pressure on the wing than the air below the wing. This creates an upward unbalances force that keeps the airplane in the air.
Can anyone shed some light on this?
(If this doesn't make sense, feel free to attribute it to the extremely high heat, and humidity, that's been preventing me from sleeping)