Why do passing trucks suck instead of blow?
Nope, it's not the first line of a joke or a rhetorical question. I would expect a passing truck or bus to be pushing a wave of high pressure air in front and beside, but I've noticed time and agai...
Forum Discussion
wnjj wrote:NASA wrote:
An example of Bernoulli's principle in the real world is a car passing by a truck. The wind rushing between the two vehicles acts like a venturi tube. Because the pressure is less between the two, the car is pushed toward the truck by air pressure on the other side of the car.
Some person, supposedly on the NASA payroll, wrote that. I certainly hope it doesn't represent an "official" position from them because......it is absolutely wrong.
The Bernoulli principle only applies to a specific set of circumstances: an enclosed tube and fluids. It is what makes carbs work....and some atomizers and some paint "guns".
The space between vehicles is not enclosed AND the things being "moved" are not fluids; they are big chunks of metal.
The tiny vacuum that is created in a real Bernoulli effect is actually caused by the air rushing past the little hole in the side; no hole in the side, no vacuum.
