Take airplane wings. They teach our kids that the plane flies because of lift due to the shape of the wing. (Bernoulli principle.) That is not true. If that were true, then a plane would be unable to fly upside down. If that were true then aerobatic planes would not have wings the same shape top and bottom.
http://www.allstar.fiu.edu/aero/airflylvl3.htm
Take simple machines. They teach that there are SIX…when in fact there are seven. Examine a bow string. Do some measurements using A^2 + B^2 = C^2. You can use the same method to pull a car out of a ditch, by pulling sideways on a rope tied to the car and a tree. You have a mechanical advantage until the rope hits a 90 degree angle where you are pulling. That meets the definition of a simple tool yet it is never listed.
How come the teachers never QUESTION what they teach?
No wonder American students are doing so poorly in the sciences compared to other nations.
Top schools in the USA….. But check out the percentage of foreign students taking the courses.
I did not knock our colleges. I complained about the quality of our teachers and what they are teaching. The two examples are things kids are being taught in grade school. If you get them off onthe wrong track early, they stay there.
Posted in Fly Tying
Tagged aerobatic planes, airplane, airplane wings, Bernoulli, bernoulli principle, bottom, fly, lift, plane, principle, shape, top, top and bottom, wing
