[Youtube Review][Veritasium] Slinky Drop Extended

(Recommended)Popular Videos : [Veritasium] Slinky Drop Extended

 

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] Slinky Drop Extended

https://www.youtube.com/watch?v=oKb2tCtpvNU

 

---

 

Summary Comments : [Veritasium] Slinky Drop Extended

He********:

How to make a floating anything:
1. acquire a slinky of infinite length.
2. tie it to the top of whatever.
3. completely extend the slinky. This will take you forever since the slinky is infinite, so make sure to set aside more than your lifetime if you want to do this project.
4. drop it, and since the slinky will be falling forever, the object will be floating!
5. enjoy your eternally floating whatever.

Hope you enjoyed this tutorial! you can get a slinky of infinite length from your imaaaaagination!

 

---

 

Playtime Comments : [Veritasium] Slinky Drop Extended

Sc*********:

1:30 that was a GOLDEN LINE! thank you so much for this recommendation youtube!

Ps**********:

If you watch closely from 0:42 you can see the ball definitely does start to slowly fall. (It starts above the physicists' shoe and is quite a bit lower by the time the slinky finishes collapsing.) This makes sense as the bottom is now significantly heavier so overcomes the inertia holding it still plus the springiness of the slinky pulling upwards.

Ma*********:

0:52 that guy looks so epic

 

---

 

Top Comments : [Veritasium] Slinky Drop Extended

Pr*********:

This works like gravity i think. I heard that if sun disappeared we wouldnt notice that for 8 minutes after it happened. So gravitation works sort of like slinky but much much faster. :) Isnt it?

Ne******:

Does this mean, if we had a long enough slinky, we could take one end into space, leaving the other end at Earth, and have defy gravity forever?

Jo***:

Have you considered that the center of mass of the slinky is in fact falling towards the earth at 9.8 m/s? So actually both the top and the bottom of the slinky are being pulled inwards towards the center of mass due to the compression in the spring being equal on both ends. The only reason the bottom of the slinky stays still is because the compression rate of the spring almost matches the rate at which gravity acts on the object.. Try the same experiment with a heavier spring and see what happens?  

My**********:

its like dominos. when you knock over the first one, the last one doesnt fall until all of the other ones fall.

ko******:

My thought is that this is NOT because it takes a while for the bottom to get the info its droping it is because a spring wants to pull in on its self, so the bottom is getting pulled up towards where ever the middle is as the whole thing is falling giving this effect. I have a whole theory on this subject. If what you are saying is write wouldnt if you droped a steel rod strait up and down with a contant pull like gravity would the top pass up the bottom? Dont think so.....

Sa*****************:

I now finally catch the fact why tom or jerry do not fall untill they see themselves floating in air

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

the tennis ball was falling but extremely slowly

Ro**************:

the statement about falling from a plane makes no sense, since at that point you are already falling

Zw*******:

so that scene from LOTR where Legolas runs up a bridge while it's falling down might not be as unrealistic as it seems XD

yo******:

The slinky is stretched by the amount of force gravity provides, so this is why it's pull force is equal to the gravity force on the bottom.

Adding more weight (a tennis ball) increases the forces on both sides equally.

Ge*********:

 @Abishek Balaji  in theory it would work for any mass, but in practice a mass too great would deform the spring and it wouldnt work. if you could find a really strong spring you could do this with a car or truck and it would work the same way.

Ja*****************:

I hope you had a skilled team of slinky detanglers standing by. 

Na********:

Please make a video where you attach several slinkys together and do the same thing but standing on top of a tall building when letting go so the bottom of the slinky will "float" in the air for several seconds! :D

Best regards from Sweden.

Wi******:

If you watch the tennis ball close enough... it does move VERY slightly, maybe < 1 inch (can't accurately tell from the video)

Do******:

If I'm not mistaken, The center of mass of the slinky is still falling at normal acceleration?

mu**************:

You can see the tennis ball fall as soon as he lets go. It's just not as fast as 9.8m/s/s due to the upward spring tension fighting the force of gravity.

Ad*****:

I love how passionate Rod is about physics. It's always refreshing to meet people who love what they do. They glow with energy.

Hy******:

@youmeeln which pants?

An********:

What is funny is if you ask a phisics genius about something other than phisics they will be so dumb in away

Th****:

I hate how he says the information takes time to travel. that's not how physics works. its not a computer waiting for data to say "ok, fall now". might as well just say its magic.

my answer:

the top of the slinky falls because noting above it is holding it up. the bottom is still being supported by the top even though nothing is supporting the top.

as long as there is uncoiled slinky above it, there's no reason for it to fall.

also, possibly, the slinky is like a reverse spring. it wants to pull itself together. so as the top is falling, it is pulling at the bottom just enough to fight gravity.

Ab*******:

Does this work for even heavier objects ? like a truck or a car!!

Ta********:

Before I watch the video I think the tennis ball will accelerate the slinky down as the forces of tension and gravity are balanced which is why the bottom of the slinky stays in the same place until the wave hits it. The tennis ball will make the forces unbalanced which means gravity will be stronger than the upwards push of tension.


EDIT: I was wrong :(

Ab****************:

he said "...until the information travels down ..." , what is the definition of information in physics?

Sy********:

I don't know much about this but if you look closely you can see that the tennis ball is moving down while the slinky is moving towards the bottom of the slinky. So with a long enough slinky, wouldn't the ball hit the floor before the slinky gave it the information that tension was released?
I'm only 13 so like I said before I don't know a lot about this but so please don't call me stupid lol. 

Mu*******:

You just add the ball to the equation while adding height of course it's going to act the same. The slinky stretched and added tension to compensate.
#PotentialEnergy

Du*****:

I knew this as a kid, i remember sharing this with my friends a couple times xD

v9**:

@slaai88 Where would the information start, where would it end? Infinity is never ending :)

Br*****:

for those who have seen the video without the tennis ball attached, the outcome here is very obvious. Think of it this way, whether the 'bottom' of the slinky has a ball or has more spring (longer slinky) it will not affect the top. The bit of the spring above the ball doesn't care what is below it.

Ma*********:

I saw that at normal speed! =O

Yo******:

would it have the same effect when you use a steel bar at the bottom ?

go***********:

Most awesome video I've watched this year so far about physics :)
Would love to see if this has been done in space/zero(or low) gravity though.

cr**********:

Nice set of videos as usual. I have a short question, though:

Would a heavier object (say a ball of led) fall somewhat "with" the spring instead of standing still like the tennis ball? I know its gravity-inertia will be the same than with the tennis ball, but would a ball of led change the force balance between the spring tension upwards and gravity enough? I think I need to buy myself a Slinky!

TB****:

If you found the center of the mass of the slinky with the tennis ball,  it should fall down normally (accelerating 9.8ish meters per second, per second).  And the top should be "falling" faster at the beginning,  because it's responding to the tension pulling it down, and gravity (just like the tennis ball is not moving because it's responding to the tension up and gravity, which equal zero).   Right?   I'd like to see the speed of the top of the slinky. :)

Ja**********:

Spoiler - you need to deliberately move the extended slinky up or down ever so slightly, either will do... as you let go. If you don't do that then you are simply dropping the top and not the bottom, since each point on the spiral weighs slightly more than the previous point if you go from bottom to top, this is a constant condition at every single point in the mass without exception. It is sort of like vertical dominos. If you weigh the last domino. It continues to weigh the same amount until the entire series falls, at which point it goes from one unit weight to the weight of the entire series, same thing for every other domino... the exact same principle applies here - the very end of the slinky, the literal edge of the end, hangs below all the other points on the spiral, and if it were touching a scale It would read zero the entire time, until the entire coil collapses and slams the last two together.. or until the collapsed section tumbles and passes the bottom. Notice when you drop the big one the bottom remains in place until the collapsed section actually passes and pulls it down. Attaching something to the bottom, especially something with a defined point that is its "absolute bottom" (say, a sphere) won't change that. move the entire mass in any way as you let go and this won't happen. Very cool though, it pushed me to go buy a slinky and figure it out so thank you lol.

Ma************:

this is a great video! wouldn´t it be interesting to see something else fall beside the slinky?
My hypothesis is that the parts of the slinky that is accelerating downwards faster then a free falling body. And that it is doing so in a way that the instant value of the, from 9,82, extra acceleration a1 following this eguality m1*(a1)=m2*g. Where m1 is tha mass that accelerates, wich is constantly increasing, and m2 is the instant value of the mass of the slinky (and tennisball) that is waiting to start moving, wich is constantly decreasing.

Might this be right?

Bi***********:

I don't have a slinky, but I think something different would happen if you get two slinkies next to each other, one is collapsed and one is stretched and then you let go. I think the stretched one will hit the ground first. My argument it that, if the bottom is not moving, then it must be pulled up. As a result it must pull the top of the slinky down, transforming the potential energy, stored in the spring, into kinetic energy and accelerating the top towards the ground (additionally, parallel to gravity).

 

---

 

[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.

 

---

 

[Veritasium] Channel Posting

[Veritasium] 10 Facts About Great White Sharks

[Veritasium] 13 Misconceptions About Global Warming

[Veritasium] 4가지 혁명적 수수께끼

[Veritasium] An Affordable 3D-Printed Arm

[Veritasium] Anti-Gravity Wheel Explained

[Veritasium] Anti-Gravity Wheel?

[Veritasium] Backspin Basketball Flies Off Dam

[Veritasium] Can Silence Actually Drive You Crazy?

[Veritasium] Can You Swim in Shade Balls?

[Veritasium] Does Planet 9 Exist?

[Veritasium] Drinking in ZERO-G! (and other challenges of a trip to Mars)

[Veritasium] First Flight on Another Planet!

[Veritasium] First Image of a Black Hole!

[Veritasium] How Does a Quantum Computer Work?

[Veritasium] How Special Relativity Makes Magnets Work

[Veritasium] How Were the Pyramids Built?

[Veritasium] I Waterproofed Myself With Aerogel!

[Veritasium] Is This What Quantum Mechanics Looks Like?

[Veritasium] Making Liquid Nitrogen From Scratch!

[Veritasium] Making SOLID Nitrogen!

[Veritasium] Quantum Entanglement & Spooky Action at a Distance

[Veritasium] Slinky Drop Answer

[Veritasium] Spinning Black Holes

[Veritasium] Supercooled Water - Explained!

[Veritasium] The Bayesian Trap

[Veritasium] The Illusion of Truth

[Veritasium] The Northernmost Town on Earth (Svalbard in 4K)

[Veritasium] The World in UV

[Veritasium] What's In A Candle Flame?

[Veritasium] Why Gravity is NOT a Force

[Veritasium] Why Machines That Bend Are Better

[Veritasium] Would You Take This Bet?

[Veritasium] Your Mass is NOT From the Higgs Boson

[Veritasium] 그림자의 가장 밝은 부분은 가운데입니다.

[Veritasium] 도대체 화씨란?

[Veritasium] 생각의 과학

[Veritasium] 온도에 대한 오해

[Veritasium] 왜 맹독성 동물들은 온대 기후에 살까?

[Veritasium] 외계인은 존재할까?

[Veritasium] 이중 슬릿 실험

[Veritasium] 임의적이지 않다는게 뭘까요?

[Veritasium] 카멜레온은 어떻게 색을 바꿀까?

[Veritasium] 파괴 불가능한 코팅!?

[Veritasium] 핵 미사일은 어떻게 발사하는가

 

---