Bernoulli 5

Magic or something

Category:

Science & Technology

Tags:

• experiments
• demonstrations
• science

[plord28]

what shame. think of all the poor students who could not wipe their ass because somone had already stolen all the toilet paper from the bathrooms :(

[wbeaty]

The frisbee part is wrong.

It's a widespread misconception that air which gets split by an airfoil must rejoin again at the trailing edge. In fact, air only rejoins if the airfoil is adjusted to give zero lifting force! When generating lift, the air DOESN'T rejoin. (Many beginners' books get this point wrong, and so they explain airfoils wrong.)

Don't believe me? Go search "incorrect lift theory" for the NASA page that debunks the misconception. It's called "Equal Transit Time" error.

[okiebsooner]

Bernoulli's principle is that as the velocity increases, so does the pressure. The video states exactly the opposite, so it is wrong. The simplified Bernoulli's eqtn is P=4v2, where the velocity is squared and then multiplied by a factor of 4. As you can see, pressure has a direct relationship with velocity. Please don't get misinformed by this video.

[mkl3opt]

Bernoulli's effect? NO.

I believe the basic premise regarding velocity and pressure is wrong in these cases. Wrong explanation to what is really occurring.

[fnairportmovies]

song?

[trekgeek1]

@wbeaty

Thank you for doing that. I was going to correct the error, but it was nice having it done already. Plus, you beat my by a year, so you probably saved a lot of people from that mistake.

[DoriWP]

GENIALES TODOS LOS EXPERIMENTOS!!

[cliveso]

The blowing across paper thing does NOT demonstrate Bernoulli's principle. If blowing over the top lifts the paper because of the "low pressure", then blowing over the underside must pull the paper downwards. Except it doesn't. Try it -- it's clearly not true...

[HipHopUploadz]

very helpful ! Thanks

[sagabhcrew]

nice, now in case i can visit USA again i know how to spread that thing around neighbors yards and so on)))

[spiralreplicator]

Perfect for halloween papering of trees and houses with the toilet paper guns, Let the fun begin !

[AlJoKo21]

@mikrosbobos Well I gotta say that I don't know why I wrote that :-D ("Of course the air is quicker above"), that's just wrong, sorry.

The right explanation is: The air particles are being directed downwards by the wing. So there is an impulse and therefore (many impulses per period) a force downwards (caused by the air molecules). Due to Newton's actio=reactio there's also a force upwards (representing the uplift). The Bernoulli-Effect is insignificant regarding the uplift.