The premise of these next few posts is that there are some poor/bad explanations out there in popular scientific understanding--or lack thereof. The goal, then, is to get us to think a little better about some commonly held ideas. Please keep in mind: I am not a scientist. I don't play one on TV or science DVDs. I'm a guy who loves to learn stuff. These are my observations based on my understanding as of posting. As I learn, I hope my views will be refined ...which is the point of discussing better science. <smile>
Years ago I produced my first educational DVD. In it, we touched on flight. We demonstrated how blowing over the top of a hanging strip of paper causes it to rise and flutter. Faster air moving over the top causes the pressure above to drop. This makes the higher pressure air below push up. And this activity is closely tied to the plane explanation on the same page of your science text:
Science Activities, Vol. 2
This basic--kindergarten level--premise was never challenged, not even in high school physics. Wings work by producing a pseudo-vacuum which is enough to keep planes aloft.
Works for me.
And then I read a "Level 3" Description of Lift. My continuous nodding and occasional "ah-ha!" of understanding was frequently displaced by confusion. I felt rather lost.
I should have read the How Stuff Works article on planes first. Very fascinating stuff--which, again, quickly moved outside my immediate capacity to grasp.
Did you know this stuff about airfoils, wings and lift? Or were you only taught the Bernoulli principle? What areas of science have you learned about which are not exactly the way you were taught them?
Filmmaker, Writer, Empty Nester