[Youtube Review][Veritasium] 수력 공중 부양!

(Recommended)Popular Videos : [Veritasium] 수력 공중 부양!

 

This time, I will review the popular YouTube videos.

These days, even if it's good to watch on YouTube, sometimes people skip it or don't watch it if it's too long.

When you watch Youtube, do you scroll and read the comments first?

To save your busy time, why don't you check out the fun contents, summary, and empathy comments of popular YouTube videos first and watch YouTube?

(Recommended)Popular Videos : [Veritasium] 수력 공중 부양!

https://www.youtube.com/watch?v=mNHp8iyyIjo

 

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Playtime Comments : [Veritasium] 수력 공중 부양!

El********:

5:07 my grandparents after I fix their tv by switching it off and back on

Hy**************:

2:18 PEOPLE ARE SLEEPING IM MY HOUSE AND I WAS NOT PREPARED FOR THIS

Na*************:

4:58
He's like an excited child!

se********:

0:38 I love how his friend was about to say something and he completely cut him out.

Sh**:

4:57 this would curiosity and discovery looked like...

Ch***:

Just look at the pure joy on his face at 4:55. That enthusiasm is so contagious, I love it!

Pr*****:

5:00 He looks like the happiest person in the world, like he won a million dollar lottery or something.

Gu***:

4:54

One day I will know happiness at this level.

Zy*:

4:50 proof that boys never really lose their sense of wonder.

ba***********:

Me: turns volume up because it's 1:30 in the morning and hard to hear the video
Veritasium: screams

 

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Top Comments : [Veritasium] 수력 공중 부양!

Ch**********:

The force of the spray down cannot equal the force of the water out, the system momentum has to be equal and the sprays in all directions put pay to this theory. In addition this would have no affect on the initial suction of the ball prior to the spin being induced. The actual explanation comes from a common misconception about the lift from airflow being from bernoulli's principle alone. In actual fact a large force comes from the coanda effect, which is the suction caused by the boundary layer on the surface in the flow. If you dangle a spoon from a string and bring the curve under a stream of water under a tap you can see this effect yourself, noting how its not the pressure differential of the two sides of the spoon causing the spoons displacement. This demonstration of the ball in water is much the same. Its the suction of the boundary layer caused by the coanda effect, not the countering momentum of the water droplets, which itself would be minimal. This also helps to explain the natural balancing to bring the ball back into the stream as the effect is exasperated by increased deflection of the boundary until the point boundary separates from the surface and the ball falls from the stream.

Ri********:

flat earthers: impossible

Ha**************:

2:17 RIP Headphone users!

Bu***********:

that ball is more stable than my grades

Rk***:

Alternative titel: Two grown men playing with water and their balls

ag*****:

Best way to have fun and spray your lawn at the same time!

Mu***********************:

I didn't think the ball was that cool, but the disc... That was bloody awesome!

gr*********:

Haha, Derek's like a kid in a candy store.

jo*****:

This is the content I subbed for not vids with the king of ad revenue

St********:

That is real magic!

fr*******:

Any kid with a hose found this out, It wasn't invented by him.

Tu****:

+Veritasium : I am surprised that you didn't mentioned the Coanda effect :-/

Pt*******************:

Use an extremely hydrophobic coating on the ball and see how the lack of adhesion changes it.

Pe***:

Derek, it would be awesome to try this with a ball covered in hydrophobic coating - if the water cannot stick to the ball, much less of it will be deflected at an angle, probably making the configuration unstable, right?

Dr*******:

Wonder if Gura can do this...

Sa*****:

Awesome! Love it

Sa***:

Banana Bread Recipe

1⁄2 cup butter
1 cup sugar
2 eggs, beaten
3 bananas, finely crushed (for serious and extreme moist and delicious, try 4 bananas)
1 1⁄2 cups flour
1 teaspoon baking soda
1⁄2 teaspoon salt
1⁄2 teaspoon vanilla (optional)

Directions
Remove odd pots and pans from oven.
Preheat oven to 350º.
Cream together butter and sugar.
Add eggs and crushed bananas.
Combine well.
Sift together flour, soda and salt. Add to creamed mixture. Add vanilla.
Mix just until combined. Do not overmix.
Pour into greased and floured loaf pan.
Bake at 350 degrees for 55 minutes.
Keeps well, refrigerated.

Ha***:

I absolutely love your videos!

Vi***********:

Would the ball behave the same way if you coated it with a hydrophobic layer?

MB****:

Legends say that If you say Laminar's Flow 3 times in a row in your YouTube video Destin from SmarterEveryDay will appear.

Ja****:

I love how excited you get for science, that genuine love of the mundane is the main reason I love your channel so much. Can't wait to build my own water spout!

Jo******:

“A hydro what?”- Squidward

Aa******:

the tutorial for making it a t home is now a private video and can't by watched anymore :( .

So*********:

His inner child came out when the ball levitated :)

Th************:

4:52 a wild veritasium appears

Co******:

Oh come on!!! again! I do a video and when I go to upload it someone beat me to it. :(

Fi*******:

there's a celebration of corpus Christi in Barcelona where they make an egg "dance" in fountains with this very same effect hahaha
it's called L'ou com balla if you want to check it out

Ob********:

I actually think this is a mixture of rotation, surface tension, a force upwards, and the counter force Veritasium mentions. Water hits the ball, starts to push it up, causing the water to cling to the Styrofoam surface, spinning it away from the water source. The rotation of the ball starts to give it stability and so the water clinging to the surface does indeed get thrown off the other side causing it to not stray from the water source, so does the surface tension and ration though. Anytime the ball gets close and hits more of the stream the rotation is slowed down thus just getting pushed by the water it moves outward. Anytime the ball strays too far its rotation speeds up throwing more water and basically wanting to climb the water like a treadmill. Nothing more I can say.

Ow******:

I had some confusion about his explanation after watching, so i will explain what causes this effect.

The effect is due two an equilibrium of these two phases:
A) The ball adheres to the water, and uses its torque to force the adhered water downward and away from the stream. This causes the ball to go the opposite direction of expelled water; upward and into the stream.

B) As it enters the stream or expels the water, the torque decreases, and the ball stops moving up and into the stream. The ball then is touching the water at the most outer point on the ball that is perpendicular to the ground, on the side of the stream.

The end of phase B actually increases torque and adhesion, which makes the ball move into the stream as the expulsion of water increases. (edit) This is where phase A begins.

De************:

+veritasium , I'm not sure if the explanation in the video is properly adressing the physics behind the effect, what do you think of the following following?

I think the system works like this:
- The water hits the ball (putting forces of momentum on the ball as described by Derek), but also overruling the vanderwaal’s forces of the waterdrops on micro-level, making the water ‘sticking’ to the ball.
- We see water leaving the ball as it rotates.
- So the mass attached to the ball by surface-tension (vanderwaals forces), decreases as a function of the angle (theta) and the rotational velocity (omega). (Differential equilibrium).
{Vanderwaalsforces < m*r*omega^2 --> m_dot (massflow)}
- The distribution of the water over the ball is significant in respect to the low mass ball.
- Radially the mass moment of inertia of the ball is distributed eccentrically in respect to the center of mass of the ball (the rotation point of the ball), by the mass leaving the ball (imagine the leaving droplets 'pulling' the ball, (local/micro level))
Visualize the ball’s wall is always thicker on the side of the beam (system level).
- The sum of the centripetal forces on the side of the beam(collocated-side) > (non-collocated side). The separation of the contribution is located at the center of the ball, which is its turning point.
- The equilibrium exists as follows:

{ Forces of momentum of waterbeam (as function of eccentricity) } + { non-collocated centripetal forces of the water established by vanderwaals forces } = { Collocated centripetal forces of the water established by vanderwaals forces }

 

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[Veritasium] We gathered comments about popular videos and looked at them in summary, including play time, and order of popularity.

It's a good video or channel, but if you're sad because it's too long, please leave a YouTube channel or video link and I'll post it on this blog.

 

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