# 5 Fun Physics Phenomena

– Five fun physics phenomena. Number one,
have a friend hold a cane out horizontally for you, or another similar object. And putting
your two index fingers together, try to place them underneath the center of mass. When they
let go, you will find it doesn’t normally work. But now try putting each index finger
at opposite ends of the cane, and then moving your index fingers in towards the middle.
What you will find is that they always end up right under the center of mass of the cane.
You can try starting off asymmetrically and they will still end up under the center of
mass. You can try going at different speeds. Really slowly, or really fast. But you still
end up perfectly under the center of mass. How does this work? Number two, the phone
flip. Have you ever tried to spin your phone? If you do it in this direction, it’s pretty
easy. It stays nicely aligned. If you spin it along its short axis, you’ll also find
it spins very well. But if you try to flip your phone end over end like this, you can’t
do it cleanly. The phone will never flip simply end over end without also rotating in one
of the other directions. Even when I make an almost perfect flip, instabilities grow
until the phone rotates around another axis. Why can’t… No, I still can’t do it. Why
is it so? Number three, you’ve probably seen that if you rub a cup on your hair, you can
make it electrically charged. And if you bring it close to a stream of water, you can actually
cause that stream to deflect. Now usually this is used in chemistry textbooks as a demonstration
of the polar nature of water. Water is a molecule with a more positive side and a more negative
side, and so what happens, so you’re told, is that the water molecule flips around so
the positive side of the water faces the negative side of the cup and that is what attracts
the water to the cup. But this is not the real explanation. If you have a uniform electric
field, there’s an equal force pulling the positive side towards it as there is pushing
the negative side away from it. And so you can’t actually do more than just turn the
molecules. You would need a really, really strong gradient in your electric field to
make this work at all, and it basically is just not going to happen from a cup. So why
is the stream actually attracted to a charged cup? That is the question. Number four, take
a piece of your favorite cereal and drop it into a bowl of water. Then using a very strong
magnet, try to pull the cereal around. Isn’t that cool? So why is cereal magnetic? And
finally, five, the teabag rocket. Take a teabag and cut off the sealed end very carefully.
Now dump out the tea. Form the teabag into a square column. And balance it on the plate.
Now light the top of the teabag on fire. Try to light it evenly on all sides. Get ready
for takeoff in three, two, one. Ha, yeah! That is the beauty of the teabag rocket. So
why did that happen? So how do all of these phenomena work? Let me know in the comments
or make a video explaining any or all of them. Or subscribe to the channel and I’ll post
the answers next week. I hope you enjoyed those fun physics phenomena. I know a guy
who would, the former commander of the international space station, Commander Chris Hadfield. I’m
actually hosting live events with him in late August in Sydney and Canberra. I’m so looking
forward to that. Now, the Sydney shows are all sold out, but there are still as of now
tickets to the Canberra show. So if you want to come to that, check out the link in the
description. Now Chris Hadfield actually wrote a book called An Astronaut’s Guide to Life
on Earth, and I’m listening to it right now as I travel around the world, and it is awesome
because it contains great advice not only for people who want to become astronauts,
but also for everyone who wants to lead a meaningful life here on earth. And you can
pick any other book of your choosing for a one month free trial. Audible is a great service
with over 150,000 titles in all areas of literature, including fiction, non-fiction, and periodicals,
and so you can find virtually anything you want there. And by going to audible.com/veritasium,
they know that I sent you and they help me out to continue making these videos for you
for free. So I really want to thank Audible for supporting me and I want to thank you
for watching.

## 100 thoughts on “5 Fun Physics Phenomena”

1. Donavan LoForte says:

Flying teabag—> same effect using rolling papers

2. Tung To says:

Cereal has iron in it. That's why it moves with the magnet.

3. Dennis Wilson says:

Number 1 only works until you factor in the friction between your fingers and the cane. Then, all bets are off.

4. Dennis Wilson says:

Number 3 is due to the minerals IN the water.

5. dlyciousmusic says:

THUMBS DOWN !!
Thats why you did not explain.

BUT you use CLICKBAIT to sell your STUFF ??
THUMBS DOWN!

6. Rio Minjares says:

My guess is that for the cane, the sum of the moments has to be zero for it to balance. Assuming the coefficient is constant along the cane, as you move your fingers closer together, the finger closest to the center of mass has a greater downward force on it than the other finger. Because of frictio, this means that the finger with less force on it slides more easily, keeping the sum of the moments at zero, until finally they meet at the center of mass.

7. Yoihen Mais says:

I think The reason why tap water deflects is because it is a tap water ie it contains other charged ions

8. kk K says:

4 : cereal contains more iron that attracts more than repelling

9. Israel Navarro says:

10. Autotrope says:

First one is negative (srlf-correcting) feedback loop regarding which finger is supporting the greater amount of downward force at any time also being the least likely to move along the cane due to friction.

Last one I would guess, is expansion of air due to heating, basically a convection current, perhaps guided a bit by shape of teabag above.

11. Cosmic says:

I think that as the ceral dissolves, it's ions are magnetic. I may be wrong.
The teabag went up because of the warm air pushing it up from the fire.
I dont know the others but now i'll watch the explanation videos

12. Will Lewis says:

3:34 now sniff all of the tea

13. Will Lewis says:

4 is because the cereal has iron in it. Wich is magnetic

14. Nygou Chol says:

Isaac Newton wants to know your location

15. DriedSquid8447 says:

3:25 spill the tea sis

16. Nisarg Joshi says:

Phive phun Fizzix fenomena.

17. Anton.d09 says:

Cereal has 100% of your daily iron requirement, that's why it's magnetic.

18. Brian Cherry says:

I always thought The Teabag Rocket was something very different.

19. Sammo_Mils says:

Cereal is magnetic because there is iron in it. You can prove this it you crush up a cereal with lots of iron, such as nutri-grain, very finely and then run a magnet through the dust. You will find that there will be little bits of iron on the end of the magnet.

20. Ghule Arun says:

https://youtu.be/mfpYjwaPGU8

guys go through

21. Manoochehr Sohrabi says:

At this very moment this video has 5,154,125 views, 2.147 dislike(for what ever reason ) and 65863 likes. the remaining 5,086,115 were too lazy to move a finger but still watching.

22. Daniel Malo says:

This is the first ever Veritasium vid I found, and I found it on Facebook. Still an awesome channel

23. PINTU KUMAR says:

Every Physics phenomena is fun except quantum mechanics it's weird

24. Scott Mitchell says:

0:56 thanks for the shitty cut away

25. Scott Mitchell says:

I know most by memory

26. Peter Tea says:

You good sir are a wizard.

27. KillerBait says:

I always flip my phone that it has become a habit of mine and it feels pretty satisying.

28. TurboGaming says:

He is amazing.

29. Rudhra teja says:

4:02 you blurred the icon of your phone so I can't find what it is what is your phone company

30. Brenden Roughley says:

Anyone else find it suss that he looks exactly to the center of mass each time well before his eyes approach it? Not saying it does not work but to me it looks like he has marked the center to remove user error making it seem much easier and more repeatable than it really is.

31. jim b34N says:

Dumb

32. s svar says:

Water molecule: the distance between opposite charges is less than distance between like charges. Coulomb’s law => for same charge, the smaller distance => greater force

33. Emiliano Alegre says:

YEAH SCIENCE BITCH.jpg

34. SaltySiegraine says:

1: one of the fingers is closer to the center of the mass wich means ot has more weight on it and thus there is bigger friction, so the other finger will be mving towards it. When it flips and the second finger will be closer it will have bigger mass pushing on it thus making friction bigger and then the first finger will move towards center of the mass. This repeats untill youll have both fingers under the centre.

2: I think this has something to do with axis of rotation. When you flipp it sideways it rotates around with mass being close to its axis of rotation or mass being perfectly balanced. When you doi it the 3rd way its not perfect and it tries to balance around the other axis. Im sure it has something in common with its mass and axis of rotation.

3: that is caused by ions in the water i believe?

4: cereals are full off iron, wich is magnetic and it does follow the magnets

5: hot air rises up due to displacement of hot air molecules? at some point the rest of bag that didnt burn yet becomes light enough it will fly up with light hot air.

i hope im right :3

35. Matt Peacock says:

The cane is simple, since your 2 fingers share the weight, they share the same same friction, as long as the COG is in the center of them
…….the friction is the governor keeping the COG in the center. If one finger gets too close, it carries less weight, has less friction and the other finger pushes the cane toward it to help balance the friction, therefore balancing the load, therefore keeping COG in the center. Kids cereal is fortified with iron….that's right, actual iron filings
…..the other ones…..no damned clue.

36. Bronson Solomon Woods says:

@3:23 he spills the tea

37. martin rekalde says:

I read "5 fcking fisic phenomena" but actually os better than that.

38. ulfa fawzia says:

I gotta say it but scientist shouldnt be this good-looking 😉

39. CΛRL ΛTTΞNIΞSΞ MΔXIMUS says:

My hypothesis on the phone rotation thing is it is not balanced top to bottom ,or lengthwise, so it is has ore mass on one side than on the other, causing a non-non-symmetrical rotation when tossed, which causes one side to be influenced by a gyration along a perpendicular axis, which leads to multi-axial occupation. That's my first guess. Or perhaps there is more mass on either side of the phone lengthwise, resulting in the same effect.

40. Samster Hamster says:

It is theoretically possible to walk through a wall

41. Sophia Cristina says:

Hey, you don't take the herb from the paper and burn the paper, you burn the herb with the paper and it'll launch you to the moon, duh!

42. Luka Rapava says:

We did not understand that you were using Iphone 5.

43. Virendra Mehta says:

nice..

44. Ethan Lee says:

He blurred the apple logo?

45. PSL 3 says:

Plz make a video on best physics books

46. Katie Giles says:

Just another example of how this guy loves to make pple look dumb! Shows each demonstration but doesnt explain why each phenomenon happens. If he was really trying to educate people he wouldnt say " COME BACK NEXT WEEK FOR THE ANSWERS!!"….cmon why would he do that? More youtube money from another video? Not even half the views will probably come back next week for the answers…theres no piont to that other than for financial gain (which is fine, but dont say you just do this cause you "love physics") or you get sick pleasure over watching people drool for the answer which is painfully obvious to you. But thats ok…you do you veritasium!….

47. Rob Alack says:

None of those are phenomenon except maybe number 5. Maybe not, but I just don't know either way. There are plenty of physics phenomenon that could have been in this video like a colloid which is a mixture of gas and liquid that hasn't been completely explained, and thus is a phenomenon.

48. Mike Bevins says:

I will show what a ROCKET T-BAG really is!!!!
come play PS4 hahaha

49. Rodrigo Lind says:

The first one is bcs when your fingers are not on the centre of mass the stick only touches one of the fingers allowing the other to move faster and thus making both fingers go back to the centre of mass.

50. Christopher Dibbs says:

Did you really just try to blur the Apple logo on what's clearly an Apple phone??

51. Yashvardhan Rao says:

Who else is coming from the explained video to tell the answers?.

52. Alex Maunu says:

Cereal has iron in it 👍🏽

53. Outdoorsman’s Creations says:

He’s so excited to see the t bag rocket work!

54. hnzie says:

The cereal liked magnet

55. Hemi says:

3:48 just beautiful

Bold of you to flip a phone

57. Hita says:

HAvent watched the vid where u explained these yet, wonder if the cane one has to do with moments? The tea bag one with the differences in temp of air in the bag, the water one not sure

58. Magician Mahesh says:

That's centre of gravity I guess… To be more precise…

59. Pearl Joy Perales says:

3:22 James Charles and Tati situation.

60. Yana Kanso says:

true

61. Llolipop studios says:

62. Tashu Tasha says:

Can I work with you ? I can learn so much of amazing stuffs

63. OllyBob Productions says:

And I now have a broken phone screen, great vid

64. Fabian Bryan Chris says:

the one with the phone is a famous phenomenon with tennis rackets as the same priciple applies

65. Karl Marx says:

2:08 don't we all?

66. subhakanta debata says:

Wow

67. subhakanta debata says:

Physics is really overwhelming

68. Tyesha Price says:

Everything immaculate everything have metal in it

69. laaksonensini01 says:

He spills so much tea in his videos.

70. dev shankar paul says:

How does a fan get dirty? That's an interesting question. Amazing video btw.

71. vexblizz says:

#4 might have something to do with the "4th phase of water." It's a relatively newly discovered phenomena that negatively charged particles inside of water seem to cluster close to non-water surfaces. There's a charge-less layer after that and then a layer of positive charge which creates a natural bi-pole which could act as a magnet when stimulated with another magnet and basically push the cereal along (and possibly even as work as a battery as the scientist explaining it pointed out). I'm no expert obviously, but there was a Ted talk that I watched on Youtube on the topic which was fascinating. I suggest you look it up.

72. Hedgehog says:

physics make me so satisfy than video that will make you satisfy. 😍

73. Statism is SOCIOPATHIC says:

Number 1 utterly stupid! How does this work, you moved your fingers 🙄. Number two, I didn’t bother to go any further as number 1 was so pathetic!

74. REDD says:

Spill the tea!!

75. Eric Lee says:

I hate you

76. Todd Wolf child says:

Heavy.

77. Alex Brandão says:

Number two I know: it is because of the intermediate moment of Inertia. The intermediate moment of Inertia of a body is an unstable one.

78. cotton swab says:

Where's Eric's comment?

79. WatchMeSayStuff says:

How many phones are now broken because of this video? Next on veritasium.

80. Mass Games says:

Guys I broke my ipad on my ben ten watch and i am relly sad :((((

Cereal has Iron in it.

82. Anthony Ratzel says:

1 the leverage changes the weights to keep an equilibrium

83. Wylo says:

Cereal has natural iron in it right? That’s why it’s magnetic. I think

84. Wylo says:

For the teabag one, the fire heats up the air which causes it to be less dense than the cold air so it naturally makes an airstream upward. Because the remainder of the teabag is very light the upstream carries the teabag.

85. DoesNotInhale says:

I thought Veritasium was cool but then I noticed they purged their comment section of the Great Salvio's psychic musings. Shame, unfollowed

86. Aleyna Inlow says:

Haven’t watched the explanation but I want to try and explain some of them. Cereal Is simple, most cereals have quite a bit of iron in them. The cane is because when you’re holding it you can feel where the center of mass is as opposed to when someone else is holding it. The rocket works because hot air rises, and flame wants to rise as well, but can only do so when the bag is mostly burnt cause it is too heavy to lift otherwise. I honestly have no clue how to explain the water one though. Off to watch the explanation!

87. AussieBlokeGordo says:

I'm guessing the phone one has something to do with the centre of gravity of it's internals

88. ThePrufessa says:

The first one has to do with equal and opposite forces in some way

89. ThePrufessa says:

The phone isn't perfectly balanced.

90. ThePrufessa says:

everything has a magnetic force

91. ThePrufessa says:

The tea bag is sucking in air via a vacuum caused by the heat and once the ashes get light enough for the rush of air to lift it it floats up.

92. Saikat Pratihar says:

The water is attracted due to static electricity.

93. Akanksha Sarda says:

'That's an iPhone.. don't DON'T DON'T ' screamed my heart!

94. Zsocc Gyebnár says:

Dude.. you have to close the tap

95. Omega Rupee says:

4. cereal contains iron
5. The teabag when burnt eventually gets less dense than air

96. Tanndo Baloyi says:

physics isn't fun

97. JonnyWisdom says:

1:48 Please can someone explain this. I think it is something to do with the cups charge effecting the surface tension of the water. Water molecules on the surface do not have a uniform electric field, since they only experience electrical forces pulling them sideways and downwards this makes the surface slightly more positive. And since the cup has gained electrons from rubbing its more negative. Hence the electrostatic force causes the water to bend when you place the cup near the stream of water.

98. Trey Coughlin says:

I sure am glad he blurred out that logo on the back of his phone. Gee, I wonder what was underneath? Maybe an android , or even Samsung .

99. DTR ranchagoda Ranchagoda says:

Good