Why Does The Earth Spin?

[@nyxxie023]

Why can't we have thousands of Dereks just roaming around the earth asking people questions? It would get people to thinking more.

[@dandymcgee]

We can, they just won't all be called Derek. Let the followers of Derek rise up and begin asking!

[@KartikayKaul]

Become Unique.

[@sieyk]

#revolutionisnow

[@MrRobinkarels]

You've anacted a force on the world Derek, a force for change. To bad ignorance has quite an inertia.

[@grinreaperoftrolls7528]

Well, could you imagine walking up to someone and asking them science questions with a camera in their face?

[@FallLineJP]

Veritasium: "Why does the Earth spin?" Earth: "Can't stop won't stop!"

[@namasaya8963]

LMFAO

[@Halifax888]

Game Stop

[@FallLineJP]

@@Halifax888 LMAO winner. Can't stop. Won't stop. Game Stop.

[@fundemort]

Earth: "Somebody stop meeee!!" The Mask: "I'll teach ya"

[@timsmith7351]

Never ever has it ever moved.

[@Rabbitthat]

Money makes the world go round was the obvious answer and no one said it

[@KayleLang]

I thought it was fat bottom girls.

[@russ3578]

Kayle Lang no... that's the rocking world

[@Mezmerize-gw1jl]

Kayle Lang Lol...

[@tommyodonovan3883]

Pata Fea I would have also excepted boats and hoos and or strippers and blow.

[@ethanrocha1535]

Is the earth spinning ? Kkkk prove it

[@VaibhavShete]

"To do with it, Gravity has nothing!" - Yoda

[@swarnimvajpai6373]

Genius 😂

[@shabnamkhatoon4980]

Gravity has nothing to do with it 🤣🤣

[@ShakeebClicks]

Lol.. Example of bad visual hierarchy! 😁

[@michaelgardner3728]

If gravity isn't involved why doesn't the bodies of water not spill out ?

[@DaylightDigital]

Ah, but why was the dust spinning in the first place? (The answer is that the net angular momentum of a huge mass of randomly-moving particles around the center of mass is unlikely to be exactly zero, i.e. a mass of randomly-moving particles has a nonzero (albeit diffused) net angular momentum about its center of mass. Tidal forces and cataclysmic meteor impacts notwithstanding, the net angular momentum of the system will be conserved independently of its spatial distribution of mass. Consequently, as the particles coalesce under the force of gravity and assume the same motion, the conserved net angular momentum of a large, slowly-moving dust cloud transforms into a dense, relatively fast-spinning planet).

[@christiantesta4250]

@@buruk3157 facts

[@johnmcvey7014]

@@buruk3157 That is why people are easily fooled. I can assure you explosions doesn't cause dust to come together to form a ball.

[@muhammadzaeem7805]

What caused that random motion

[@spectrumofcreation5679]

Here's a question What came first gas, liquid or solid? I think liquid. And the other 2 a just variations of frequency wavelength and hot cold pressure. And the Bible says so.

[@user-lp7tx1fe6t]

@@spectrumofcreation5679 the Bible says so is not a good proof of anything scientific.

[@dosadoodle]

It's fun to look back on these early videos and see Derek's development. This early video is pretty critical of participants than later videos, which isn't a great strategy for people who also didn't know the explanation and watched the video to keep an open mind. This is not a critique of Derek, but rather, highlights the evolution of his work -- and that effort to improve the flavor of these interactions is something to be commended.

[@Muskar2]

How did you conclude that it's not a great strategy for people who didn't know the explanation? I did know this basic version of the answer beforehand, but generally I love getting asked questions like these without knowing the answer, and I think Derek handles people's ignorance extremely well. He has no urge to swiftly correct them, nor does he judge them for what they say, he gives them clues when they're stuck, and he clearly shows an interest in their learning process and empathy toward their struggles. I can't imagine a better teacher. Unless you're talking about the video subtext which I suppose can be perceived as judgement and I agree that wasn't optimal.

[@javedalam5549]

@@Muskar2 Pretty sure he's referring to the editing

[@ashhiswhere]

true

[@OxybroCone]

This IS a critique. Poorly presented video. Down to the 30 second black fadeout at the end

[@juanmoralesvideo]

"Because of inertia" is not the correct answer to the question "Why something is spinning". Inertia could be the correct answer to 'why something haven't stopped moving (or spinning) yet'.

[@zagyex]

stuff stops moving because of friction not because the lack of intertia. Photons dont stop, but they have no mass - meaning they have no inertia.

[@juanmoralesvideo]

@@zagyex Well... My brain hurts now.

[@stevencooke6451]

Exactly. Why was the dust spinning? He's more thorough now. And less full of himself. I guess he's both matured and gotten smarter.

[@Mrgamezombie1]

The earth is not spinning and its flat use ur head idiots, look out a plane and let me know if you see the earth spinning 1000 miles per hour, yall would believe if they said we were living on a living donut

[@juanmoralesvideo]

@@Mrgamezombie1 You made me laugh so hard! Thank you.

[@alexmueller4047]

"Is it because of inertia?" (Me)*there getting somewhere!* "that every action has an equal and opposite reaction?" *facepalm*

[@jwwjjf23]

Not knowing the difference between "they're" and "there" *facepalm*

[@notchipotle]

@@jwwjjf23 😂

[@harshityashwardhan]

😂😂😂

[@Mr_Contract________x]

Wrong

[@ishworshrestha3559]

Ok

[@ajay0841]

Earth spins because it was formed out of dust that was spinning. Why was the dust spinning?

[@viyusavery248]

+Ajay Kumar it has do with the violent creation of stars.. not a good answer but a start lol

[@ajay0841]

So gravity did have something to do with the spin :P

[@cuestionalotodo972]

+Ajay Kumar hahaha

[@cuestionalotodo972]

+Ajay Kumar good point

[@ajay0841]

Walther WagDoodle thanks mate, i know why it does. i just wanted to point out that gravity DID have something to do with the spin. if you note, he says gravity has nothing to do with it XD

[@Daruqe]

My bumper-sticker-sized way of thinking of it is this: The Earth keeps spinning because it has no reason to stop.

[@lukapopovic5802]

Daruqe Well, that's pretty much how inertia works. It is good intuition

[@Anonymous-vh6kp]

Luka Popovic It’s not pretty much how inertia works, it IS how inertia works.

[@jaikishan6128]

you are basically re-defining law of inertia

[@anjaneyacharypabboju3682]

Then why did it start spinning??🤔

[@bananaforscale1283]

@@anjaneyacharypabboju3682 Because meteors, planets and all stuff in space hit each other all the time leaving them spinning.

[@AndrewHaan]

The end isn’t enough to fully explain why. It’s not only that the dust was already spinning and inertia kept it in motion, the largest factor to its spin, especially currently, is due to collisions with other objects. All objects in the Universe started as countless numbers of different dust particles at least near infinitely small. Gravity caused them to collide and thus grow in size, and different speeds and angles of collisions due to gravity caused them to all have altering rotational speeds and directions.

[@RishabhSharma10225]

That's an interesting idea. But shouldn't it be that since all collision angles are randomly distributed, the net result be zero? So zero spinning. But all planets that we know of, have a large angular momentum.

[@mmehdi3437]

@@RishabhSharma10225 Even if the net result of all the collisions in the universe be zero (which im not sure of), we are not looking at the whole universe, just one piece of it

[@klauswulf-andresen9280]

@@RishabhSharma10225 in average zero yes. but the probability of exactly zero is zero.

[@DieFlabbergast]

That doesn't answer anything. Why didn't the various particles collide and spin in opposite directions, thus canceling each other out?

[@JHSullivanIII]

They do collide in all directions as the mass of dust accumulates (so gravity is really the original force here), but the likelihood that all of those tiny collisions will EXACTLY cancel each other out is practically zero, so instead a slight spin begins in one direction or another, and once the spin begins it becomes slowly more likely that each tiny collision in the accumulating dust will reinforce that spin. Gravity continues to collapse the spinning dust inwards towards what has become an axis of rotation, and the conservation of angular momentum speeds up the spin, like a spinning ice skater bringing her arms inward.

[@Sarcasticron]

Actually, since the Earth was formed out of an accretion disk, gravity has everything to do with it. The Earth spins because the accretion disk gathered spin as a consequence of the gravity coming together. So the Earth does spin because of gravity--it doesn't STOP spinning because of inertia.

[@MrAndrews220]

Technically correct, the best kind

[@jaggerjacks8795]

:O

[@spectrumofcreation5679]

I believe gravity is a result of compounded inertia forces! And all atoms have a electron inertia force with different speeds and amount of electrons you end up with different density fields of inertia that in turn creat different elements.. the law of inertia is in every aspect of life and matter! Now what is static electricity? I am starting to think that it is electron inertia fields.

[@nicolasmoonlit8109]

@@spectrumofcreation5679 Well... You're correct in a way, that gravitational pull is a consequence of such property of matter as inertia. Massive objects create curvature of space-time, thus creating gradient of rate of passage of time ( 3 "of" in a row, yay!) Because of this gradient and inertia path of objects bends as if there was an actual force. (but in 4 dimentions those paths are still straight lines)

[@Mr_Contract________x]

Wrong

[@GunnarWahl]

but gravity was a major reason why the dust was spinning in the first place (think of an orbit, now if the orbit came to an end, and the 2 objects collided, the one that was going around the other would cause the combined to two to spin the direction they came from, hence it's spinning) so Gravity is why it is spinning, Inertia is why it is "Still" spinning today.

[@joofmagoof2841]

Inertia isn't a force, it's a property. Therefore, Gunnarwahl is correct. As he/she said, gravity has sparked the change and is the main FORCE behind the colliding particles. Inelastic collisions between particles CAUSED rotation because they must conserve angular momentum. So when someone asks caused the Earth to spin, a correct answer would be GRAVITY and CONSERVATION of ANGULAR MOMENTUM. Why is it still spinning? The earth's inertia, aka property. Pencilcheck....you're response is just plain wrong on too many levels. Screw these theory arguments, your attempt at correcting someone only shows your lack of understanding of basic physics concepts. The guy doing this video should be just as embarrassed for doing the same thing to those people.

[@spectrumofcreation5679]

Gravity is inertia. Inertia is a kinetic force. And the effects of inertia can be felt. Swing a object around you on a string. The inertia force created will want to keep going the direction you sound it when you try to stop it. But someone just outside the reach of that object will also feel the inertia force as it whips by them. And if it's not a force explain how a yoyo spinning at the bottom of a string really won't change axis very easy. And then look up the sea keeper and understand how that works. It creates a inertia field the keeps a boat from rocking in the water. It will Bob up and down but won't tip side to side. There are so many different inertia forces going on all around us that. Every atom has electron inertia force. The planets have inertia forces on and around them on top of different inertia fields that effect each other. The next major break throughs are going to be in technology working on these principals. One thing about non man mad things is there is a major pattern from a micro scale to a macro scale. The laws of energy. Up next! What forces make the initial inertia force in the begin with. God. When he speaks things happen. Well if you really think about what is in all matter. It kinda makes sense. God is not man so when he speaks it's not the same as when we speak it's much much more. So the cosmic vibrations created by God speaking. Made the first atoms. That cosmic static turbulence. Created all inertia forces that are like a glue holding atoms together and making more. I don't know if you believe in God. But hey that's where I learn most this stuff is asking in prayer and then getting answers in ways that I understand. At least that's where I think the answers are coming from.

[@timoaks9633]

Where did the dust come from?

[@seeking-anandam]

@@timoaks9633 The dust came from the accretion disk that formed during the formation of sun.

[@impoppy9145]

But what is gravity ? xD

[@Hwyadylaw]

These videos makes me feel like a genius...

[@PeterWMeek]

I had one of those balls that was 4" in diameter, accurate to 0.001 Inch (about the same accuracy). When it was first installed it rolled perfectly. We had to do some plumbing work under it and when we reinstalled it, I used a VERY accurate machinists level to set the base. We were shifting shims with a differences of 0.0005 inch (0.013 mm) until the base was leveled to my satisfaction. The ball would not spin. The manufacturers (I suspect the same as the ones who manufactured your ball - there are only a few and they are the best) said that they never expected anyone to level the base that perfectly and it required a small amount of misleveling to operate properly.

[@davidsandall]

Nasa is master of deception.

[@Fonzleberry]

Technically we can say that dust which came together was being pulled by gravity. So gravity DID have something to do with it.

[@jemand8462]

the dust could have come together without spinning, so no, gravity had nothing to do with the spin itself. You can't say "the sun has something to do with it because the earth wouldn't be here without the sun" either.

[@harscomcharibo]

@@jemand8462 The dust may have been moving almost imperceptibly, and in many different directions over a huge area. As gravity coalesced the dust into a disk, and then into a sphere, the gradual movement of the dust over a huge area was concentrated and combined into the compact spherical earth. Like a ice skater pulling their limbs in to their centre to spin faster. So yes, gravity certainly did have something to do with the spin. If you take any two objects with any two random velocities, and make them attract each other, it's almost impossible for them not to spin before they collide. If the space is large enough, and the velocities high enough relative to the size of the objects, it becomes increasingly rare for them to ever come into contact.

[@ahmadtalaei]

So why the dusts were initially spinning?

[@MrGupta1337]

Ahmad Talaei because in an early state of our solar system there was an extreme amount of dust (more like giant rocks up to kilometers wide) was orbiting the sun. as much of this dust collides it becomes big enough in mass to slowly attract more dust and because much of the dust was already moving in a direction (becasue its orbiting the sun) the dust close to the (early state) earth starts to orbit the earth instead. the dust spins closer and closer to the earth the same way clouds of dust spins around a black hole until it reaches the black hole. so all the collisions coming from mainly the same direction made the earth rotate on its own axis. hope this was a good enough explaination :)

[@chetanphoenix]

Simple explanation: all dust particles were in straight motion but due to gravitational attraction, start experiencing sideways force and eventually start rotating each other due to centripetal force.

[@spectrumofcreation5679]

What makes them think it was dust in the begin with? And where did the dust come from? Here is a question What came first liquid, solid or gas? If it was a where did that come from. Like wise where did the gas come from? I think it started in liquid state. Seems you really don't get gas straight out of solid and you don't get solids right out of gas. The liquid is the middle ground and well you have more variations to go to from that state. And that's also what the Bible says water.

[@flubsdubz6247]

@@spectrumofcreation5679 But you cant get liquid with out gas.. Because water is made out of 2 gases Hydrogen and Oxygen which are gases

[@sahilkate1061]

@@chetanphoenix actually they started to rotate due to inertia Not Centripetal force and Centripetal force is created when the object is spinning

[@mikesteffensen6017]

Oh boy, has this channel come a long way!

[@MegaDhruvesh]

Just a big thank you for introducing your channel to the world. You have definitely made it a better place!

[@MickHellstrom]

The last minute of this video, you've probably single handedly changed that kids life forever! Absolutely fabulous.

[@danielschilling2011]

Derek is a much more patient man than I. I for one am glad he does these.

[@ashishtiwari1912]

You're doing a good job educating people...keep it up !

[@amahronald8571]

Please could you explain the mechanism that keeps the granite ball in the video spinning? The engineering is impressive. Thanks

[@achavan7664]

"Why does the earth spin?" "I don't know, gravity?"

[@vermillion8521]

A Chavan Atleast he admitted he didn't know

[@xeno4162]

The man in the green was talking like he has mastered classical mechanics.

[@fndeeerbender]

he's just keeping up with Derek, but its good to know that at his age, he still knows basic physics. Probably 20 years from now, you won't remember a thing.

[@user-fz9yv9ei4z]

The main reason people don't know why earth spins is definitely because nobody every made them curious about. All they thought they had to do in life was graduating, getting a job, taking care of their kids and then dying.

[@listen1st267]

Well that's overly generalized and unusually cynical

[@jnmhandu]

i've just started secondary and i am obssesed with this. most kids would think this was boring but i find it really interestring

[@goldensnitch5492]

i agree and relate to you sooo much. I love these types of videos but i got no one to share it with. If u get the notification of this reply then pls reply me. We might become better friends :)

[@technoman53]

Does someone come and spin that every once in a while to keep it going?

[@blackkissi]

I can't imagine that someone wouldn't do that once in a while.

[@Mackoloco]

probably because of air friction there is a force that tend to slow down the rotation

[@animatorgeek]

I would guess that he aligned the sphere and made it spin in the "correct" direction for the sake of this video. There's a similar spere at Disneyland and it's fairly easy to get it to spin whatever direction you want, if you work at it for a bit.

[@maximgysbrechts2240]

1st law of newton object will keep going for ever if no outside force is aplied. there is no air in space so no friction to slow it down so it keeps moving at the same pace

[@animatorgeek]

Maxim Rahl Strictly speaking there is no friction from _air_. There's probably a negligible amount of friction from space dust. But there's an appreciable amount of friction affecting the rotation from the moon. Tidal forces try to deform the Earth in line with the Moon, gradually slowing down the Earth's rotation. The Moon succumbed to those forces a long time ago and that's why it keeps the same side facing us at all times. If you go back a few hundred million years the Earth's day was shorter, adding up to around 400 days in a year. That slowdown is mainly because tidal friction due to the moon.

[@janeweber8654]

If I was asked this question, I'd be confused too. Do you mean What keeps it spinning? What started it spinning? Why did it start spinning? Why is it still spinning? The questions kinda ambiguous, if you want to know why it's spinning, the answer is because something made it start spinning. What does this question actually mean?... Anyone actually get it?

[@jondeveaugh615]

Simple earth does not spin.. There is no evidence for a spinning earth. Secondly you are confused because the large ball here is spinning artificially, but he tries to explain a different scenario then that of why that black ball is spinning

[@MrYosh792]

Jon Deveaugh "There is no evidence for a spinning earth." What about photographic evidence ?

[@Brainwasher555]

Jon Deveaugh ikeppsovapiramida

[@spectrumofcreation5679]

You are a smart commentator!! He asked a question and you asked even more to understand his question to answer it. Which tells me you have a lot of understanding to sort through before throwing a answer out there. The best kind of person to have in-depth conversations with!!!! My question to you is Where are the many places that see the laws inertia at work? Think macro and micro. Think about the very concept of kinetic energy ( seems that what inertia is). Next question What happens when you have a compounded inertia fields with different axis all with the same center. Remember the effects of the eye of a tornado. That is one dominant inertia field. Once you have that built in your head what happens if there is a multi layered ball with different states of matter making that ball? What would be the calmest place in the whole concept. In my opinion gravity is a result compounded inertia fields. But hey I could be wrong. Nobody has ever told me it was or wasn't. It just makes sense! And if someone can prove it. They would most likely become very wealthy because the amount of technology that will result from this understanding. Think about space travel. One of the problems they have is traveling to fast will destroy the body. Well it's like the eye of the storm. Creat a compound inertia field and you pretty much make a atmosphere to protected against the g force and multiple other things. Figure out the statics of electron inertia fields and discriminating control factor and then you could also make a denser field, like a force field or shield. But back to the question up there Where all can you see the laws of inertia in effect?

[@iCore7Gaming]

@@jondeveaugh615 oh no flat earther alert

[@Flagyouraccount]

2021 this editing spoke volumes, loved it.

[@vladen14]

I felt pretty stupid for not knowing why it spins. turns out, most people don't know it, nice.

[@davidsandall]

They dont teach much about what they say this earth is because if you knew what they claim everybody would see what a bunch of nonsense they have made up to hide where we really are.

[@angusheath5321]

@@davidsandall Where are we then, exactly?

[@davidsandall]

@@angusheath5321 I have speculation and if I had nasa's 22 billion dollar annual budget I could tell you. I know we are not where nasa tells us.

[@angusheath5321]

@@davidsandall Why isn't anyone with 22 billion dollars or more not put a single dollar into this, even though they have zero affiliation with NASA. Elon Musk is in competition with NASA, has beliefs that were in a simulation, and with his hundreds of billions of dollars has gone nowhere with that idea. Also, what exactly is your speculation. Simulation? multiverse? or are your distrustful of NASA and assuming it has to be somewhere else, but you are not sure of where?

[@davidsandall]

@@angusheath5321 I believe a group of people "control" the world and also control everybody who is rich in the media. Musk, Branson, Gates, and so on are controlled it seems to me. Nobody that can't be controlled would ever be allowed to become rich/famous. Musk sent a tesla into space and a rocket to Mars is ridiculous. It's provable that what nasa says is lies and I see no proof of a spinning earth.

[@zarahalora7567]

The earth spins slightly off its axis due to the combined gravitational pull generated by the gigantic balls of these guys. (joke)

[@michaeltreadway1817]

I love this video!! Besides all the great information, the video has a street magic vibe :)

[@stevensneedberg4879]

Please don't. Derek is DEAD WRONG. This is something I would expect from a kid who failed all his middle school physics exams. When you look at a chunk of the Earth, if there were no gravitational force, it would continue flying straight and would move away from the Earth. Have you ever tried spinning a wet ball? That's what would happen to the Earth. However, if you had some centripetal force (in the case of the Earth, gravitational force), the ball would continue to spin, and the ball would stay a ball. The granite structure there continues to spin because chemical bonds provide the centripetal force. He literally says the Earth continues to spin (i.e. not "maintain its state of motion") because of inertia, which is so hilariously incorrect, LOL

[@killerkarnickel671]

One thing I haven't thought about yet is that if a big meteor hit the earth it would also change the rotation. So in case we survive the days might get longer or shorter after the event which would have an enormous effect on all living creatures

[@yeahnahmate1560]

Good question. The earth spins at the rate it does due it it’s Moment of inertia. This can be seen when you spin on a desk chair and move your arms in and out. So when mass is added or the masses moves closer or further away from the centre of rotation, the angular velocity will change. Hope this answers your question

[@shayanid1415]

According to a theoy it has happened in the past when earth's twin planet collided with the earth and therefore the earth spins at an angle

[@dementeddr]

You still have to preserve momentum though, so the momentum of the particles and radiation still has to be accounted for after it hits the atmosphere.

[@ji7iij]

That large Globe spinning and floating on water is just so marvelous prodigious and impressive. So is Derek Muller.

[@dandymcgee]

"The Earth does that without any forces, this (gestures giant globe) does that without any forces".. somehow I find it harder to believe there is no force acting upon that globe to keep it spinning. Otherwise, friction would cause it slow and eventually stop. While the net force may be zero, there are forces at work.

[@ozcam666]

The friction from the water holding it up is almost zero, so it is not incorrect to state that the forces are balanced and the granite globe has ~0 net force on it

[@naveenk2524]

Yes. Maybe we haven't figured the real reason of every planet, star, black hole spinning. It is hard to believe that inertia is the cause.

[@benrider6552]

But why was the dust spinning?

[@JackalGYT]

Because of the way it collapsed.

[@henryparker3420]

ha, the question I wanted to ask and yet it still has no answer

[@benrider6552]

i know why, it's because of differing densities in different areas of the clump of matter that formed our sun and solar system

[@henryparker3420]

but a systems angular momentum is conserved so if the dust wasnt spinning in the first place then it wouldnt just start

[@fergochan]

That's the point I was clumsily trying to make earlier. The nebula isn't a closed system. By interacting with other clumps of matter earlier in the universe various parts can start spinning as long as the total angular momentum doesn't change.

[@n_digit_flow_9621]

Thankyou very much sir, I searched it for about 1 month, but everyone says about what happens when earth stop spinning, and no one can actually explain why actually the earth is spinning? so most thankful to you sir

[@truemmerable]

This video did not explain why the earth is spinning, it only makes the first step towards an explanation at the very end. Normally, you go much deeper!

[@kovelamanas9905]

what else do you want know regarding spinning of earth? Its clear earth formed as a result of mass accumulating during the formation of solar system. In other words debris revolved around our sun and finally formed planet known as earth which retained its motion of rotation and the cause is explained in the video.

[@reginaldking5905]

"there is no force." Damn it.

[@poisedperson6475]

There is though. The force that you exert to learn. Keep it up :) we're all trying our best! Except Trump supporters and anti-vaxxers... Yea.. they aren't trying.

[@Astromath]

My explanation would have been: Before the solar system formed, it was a slowly rotating giant "cloud" of gas and dust. Due to gravity it began to collapse and because of conversation of angular momentum its rotation accelerated. Then the cloud collapsed completely and formed the sun, and the accelerated rotation of the remaining gas and dust caused it to be "pushed" into a flat disk orbiting the sun. Due to small irregularities in density and due to gravity planets formed. Again, because of conversation of angular momentum, the planets were rotating and since there's no drag in space, because of inertia they kept doing so until today. Another factor for the earth's rotation might have been the theoretised "Theia", a planet colliding with the early earth. It's a model for the origin of our moon

[@iamadityavaishy]

I never had that imagination that cosmic/planetary dust would have caused Earth's rotation. I had a notion that Earth's spin had to do something with the gravitation force of the Sun. No it's all clear!! Newton's 1st Law of Motion Space is almost frictionless 😜 Thanks Derek

[@derrydalek8333]

Inertia? Shouldn't that be momentum?

[@superflyslay9740]

no

[@jemand8462]

momentum = mass x velocity. can be zero. inertia can't.

[@mishmosh74]

Really enjoyed watching this, thank you. These videos are very interesting and helpful. More please! :)

[@calabrais]

Even if they were wrong, at least people 12 years ago tried to think and come up with a logical answer. Today you would get a lot of answers like "get out of here with your woke globe earth propaganda"

[@Scatteril]

12 years is yesterday

[@resurrectionway]

how does a solid object the earth spin at different speeds and does not tear its self apart. its not like the earth has movable sections because it does not .

[@bonnibelle]

+Carlos Gomez That's because all matter is attracted to all other matter, that includes all matter on Earth, the larger/or heavier the mass the stronger the gravity, the attraction must be stronger than the momentum and that's why it doesn't pull apart, But none the less you may be onto something there because black holes are probably spinning at a faster rate than gravity and they're probably actually ripping everything apart, instead of everyone's theory of pulling things in (which I think doesn't makes sense at all)

[@hey7328]

+Carlos Gomez earth's crust has tectonic plates which move

[@CerealGamingTV]

the surface doesnt rotate at different speeds, it moves at different speeds. speed is just the measure of how much distance is covered in a given time, rotation is how many rotations an object will complete in a given time. by the north pole, a given spot on the earth will complete one rotation every 24 hours, as will a spot on the equator. the spot on the equator has to travel 40000 km to complete one rotation whereas the spot near the pole might only have to travel 10km, say. thus the spot by the pole is travelling at (10/24 km each hour so) 0.41667 km/h, and the spot on the equator is travelling (40000/24 km each hour so) 1666.66667 km/h but both parts only complete one rotation.

[@resurrectionway]

as i understand the rotation but is the physical earth that spot you mention traveling at 40,000 km or is it the atmosphere.

[@SaryTheWolf]

+Carlos Gomez I assume turtle was talking about a spot on the ground, not that it really matters, the atmosphere more or less moves with a ground beneath it and with the ground moving at 1700km/h any wind would make little difference to the speed of the "spot" of atmosphere.

[@yourevolution7850]

I am addicted to you and your videos ! Want to meet you once in my life !!

[@Reylaymon]

how do you keep a straight face talking to people like this

[@1AirWind]

So theoretically it is possible to stop the earths rotation? Could be an interesting topic to a video.

[@mudhen24]

+Le Šalc Vsauce covered that one! Check it out.

[@guilhermealmeida1695]

+ryan bresnahan which video?

[@ChunkyChopsable]

+Guilherme Almeida just look up "What if the Earth stopped spinning?" Im pretty sure the video will come up first.

[@guilhermealmeida1695]

thanks

[@chetanphoenix]

If earth stopped spinning, everything would start flying around in the east direction. Even mountains will get ejected, fly off and land somewhere far in pacific. Do we really want that?

[@CAPSPORTS]

Derek : Physics Question People : G R A V I T Y

[@deanthemachine5921]

And just like all scientists, you still didnt directly answer the question.

[@yourlordandsaviouryeesusbe2998]

All scientists?

[@raviand26748]

omg i feel a lot smarter now

[@adityamohan4963]

Let me Explain : 1. Sun's gravity pulls the earth towards itself, so the earth experience centripetal force and centrifugal force. 2.due to these alternative forces , the earth results in creating a torque force qhich makes it to spin. 3.And also Our solar system is also orbiting the Milky way galaxy, so that results the earth to move forward and spin .

[@MrAndrd1]

People are SO stupid!

[@animal854]

Inertia applies here as well. If a force of knowledge is applied on them, like this guy does, that will help them get out of the stupidity gradually:P

[@SolsticeKing]

Sravan Appana Lol interesting way to see it, though, I wouldn't call them stupid, in fact, that's not a "Law" that many know that easily off the top of their head. He just got things mixed up, and there for you can account him for being stupid. Someone who is stupid wouldn't say anything close to that nor would they get it after it was explained time and time again. It's not just that which makes them stupid, what get's them to be STUPID is if they are rejecting any evidence Derek has said and they disagree and try to promote their own reasoning to which clearly isn't correct. Excuse me if that was a load of jumble to you, I tend to ramble, so I do hope that made some sense.

[@Aaron.Reichert]

That is not the point of these videos. it is not about people being stupid or him being smarter. It is about helping people who want to learn. If you keep going though the list you should come across the one where he explains his methods clearly and using math/statistics.

[@MrAndrd1]

Aaron Reichert I saw that. My point still stands.

[@kennethflorek8532]

The main impediment to accepting inertia is that people are so intelligent, not that they are so stupid. It took a very long time, almost all of the history of mankind, to strip away all that intelligence, to get at the concept of inertia.

[@syawkcab]

Derek's video editing skills have improved

[@stephenaviaspace5056]

The law of inertia is very important on why you don't fire a rocket motor all the way through to get to another planet in the solar system. It also explains why you don't fire a rocket motor continuously while in orbit, and that's why you continuously move through space orbiting the earth. Many people believe that constant motion requires constant force, because people grew up on earth in the atmosphere, and the atmosphere and the ground have friction, which produces friction that slows everything down that is inside the atmosphere. That's why you can't orbit inside the atmosphere, you will burn up the way and slow down, coming back down to earth. Inertia is a very important law in rocket science.

[@androumac1169]

I think part of what caused the earth to spin is from collisions in the past. Gravity actually has a small part in it, because the sun's gravity is actually slowing the earth's rotation down, but it also keeps it going still, from tidal forces,

[@dranzhu931]

Maybe bigger chunks of dust were just rotating towards each other due to gravitational pull at a point and then they came closer and formed a bigger body and kept that motion due to inertia. Cuz there was no external force that stopped it. Idk

[@wind1go]

the young kid at the end gave me a real positive feel of hope,i wish him to continue on the scientific path !

[@vikrant_1401]

True

[@maxthomas-bland4842]

That eyebrow raise at 'centrifugal' force 1:16. Derek too classy for not calling out all these people

[@richardhall4124]

Man you've come a long way

[@tarushsharma6625]

I watched this video approx 9-10 years ago and now again it came in my suggestion....wish i could be timeless like this video. oh my lost time.

[@bobstevenson3130]

POV: Derek dunks on a bunch of kids with his knowledge of inertia

[@moatl6945]

I grew up about 20 km away from the locality of the company that made this fountain. I know this type of fountains for over 30 years, now; and still it's always fun to play with. :)

[@randallvargas4457]

Hell yes! I only had to go back 11 years to find a video with something I could explain; It's inertia!

[@angusheath5321]

Yes, as that is why the Earth keeps on spinning but does not stop. However, the reason the Earth started spinning is not inertia, but instead from the formation of the Earth, when lots of small spinning objects collapsed together to form a large spinning object, in essence.

[@sureshravikumar6523]

I'm watching this 2021 and wishing that you can do these things again... Talking with people... It's fun really

[@baharul3514]

OMG! This video looks as fresh as new. Can't believe it was 10 years ago.

[@Dawg06]

Too many people over thinking this answer. Every thing that condenses in on itself exerts and inward inertia. This inertia can never be alight perfectly because that would require the distribution to be perfectly exact to begin and equal everything condenses in the exact spot it needs to and randomness will always find its way in and this will always lean to a most common direction

[@lohitnagar5700]

Can someone answer this? Pretty much every celestial body spins, is inertia the sole cause of it. Does the formation of planets and stars somehow forces a spin on them?

[@VNavale]

But why was the cloud of dust spinning? What gave it's spin? Some say it's the death of a nearby star which caused the spin and the dust to collapse to form the sun and the planets. I don't know, I'm a physician who should've been a physicist.

[@BiomeSiege]

Thats mainly the reason im so fascinated about the universe and science in general, we havent even discovered a fraction of what is arround us, not even everything on earth.

[@julianhamm4343]

The reason why it's spinnning is because there are infinitely more ways for something to be spinning than not spinning. Not spinning is really just spinning at a rate of exactly zero. It's the same with linear motion. There are infinitely more ways for something in space to be moving relative to any other body than to be exactly motionless relative to it.

[@stuart124]

Why? Because water has memory, and it remembers watching Conan the Barbarian pushing heavy things in circles.

[@jemand8462]

how much water pressure does this thing need in order to keep it floating?

[@mph8759]

Inertia keeps it moving, but it is conceivable that the spherical cavity that holds the granite ball is not perfectly spherical and hence concentrates the water flow into one direction over another. That would result in friction that would accelerate the granite ball. Inertia would keep it moving but the water flow would make it spin and determine the direction of the rotation. The check that Derek should do is to completely stop the ball and then wait for it to either remain without rotation, or to start spinning. My suspicion is that the spin is more due to the water spinning it than due to its perfect inertia and the one guy that gave the granite ball the spin a couple of years ago.

[@sachiel5545]

I just typed this title in the search bar, thanks Veritasium ❤️

[@Magiicmaster]

Truth be told, my aunt actually has a smaller version of this ball on water. BUT the water is angled in such a way, that the ball starts rotating even if you don't push it. Therefore, some of the people were right.

[@AlexZander688]

But at 0:19 to 0:23 What is happening with the water? The weight of the granite sphere is pushing it out into the moat around it. Is the water draining down into a fountain mechanism and the fountain pushing the water back up underneath the granite sphere?

[@krayto5]

Did you do something funky with the thumbnail? Hahaha why is this on my feed?

[@have_a_nice_day399]

Okay. Since I am waiting for my experiment to finish here, let me explain to you a little bit. Consider 4 situations: (A): Suppose we put two perfect spherical planets in a perfect universe, which has no dark matter or any other gravitational effect on them. Give them an initial rotation. They will keep the exact rotational speed forever. (B): In situation(A) , give one of the planets a spin. because they are perfect spherical, the spin and the rotation speed will be independent.

[@bob-kt2cv]

when your science teacher sends you to this video too for homework😑

[@bob-kt2cv]

@Tod Wilkinson how?

[@rob5894]

Actually, gravity does have something to do with it. Without gravity the earth would fly apart and wouldn't spin at all.

[@farazhaider93]

Did you know that The Three Gorges Dam (175m above sea level) slowed down the earth's rotation by 0.06 microseconds because it altered earth's moment of inertia?

[@stevenstart8728]

Per what? You have to say 0.06 microseconds per year, per day, per century.

[@jessrowell7152]

Earth completes a full rotation every day. It completes a full revolution every year. Please update the description.

[@mrsprite399]

In physics it's hard to get the answers of "Why" but "How" Why is earth spinning? Nobody knows How is earth spinning? Inertia of mass and also net external force is 0.

[@Ultiminati]

Yeah it doesn't answer why at all. +Why does it spin? -Because it was spinning and with law of inertia we know objects maintain their state of motion. +So earth is spinning because we observed a property in all objects around us and said it was a law... We see maintain of motion We define it as a law We see maintain of motion, and ask why, the answer is because it is a law... Circular reasoning

[@Ironman-vq2xh]

Well, i typed “why does the earth spin?” And found another rabbit hole to go down with this guy.

[@salehhamza8341]

Dude!!! Lines from Daft Punk's Get Lucky - "What keeps the planet spinning? The force from the beginning" N.B. Although It's inertia, more specifically conservation of Angular Momentum, but the concept is there

[@kamranmoazzamansari7289]

come to think of it, if by any ways we stop the earth from spinning, it would just not spin again

[@entangledmindcells9359]

Yep.. ask the moon

[@Reelworthy]

It spins for the same reason that that granite sphere spins…. because someone set it in motion

[@commentator1338]

You know you've been using youtube for a long time when this video gets recommended to you twice already

[@randompark9026]

The yellow man has a good understanding on physics... but there is a lack of bonding between theory and conception... Apart from that he has ggod observation 👍

[@richardli8272]

What if an asteroid knocks into the earth and it slows the spin to a stop

[@BeachJedi101]

With solar winds, gravitational forces, coronal mass ejections, etc. Wouldn't something eventually speed us up or slow us down? Why is it so consistent. That's what baffles me.

[@rishav2320]

I actually searched for it.... It was amazing man

[@dadadadoog]

The question of what started it spinning is a bit misguided in that zero rotation (angular momentum) is not some default state. It seems that way because we see few things around us spinning unless we set them in motion. That's because there are torques such as friction opposing rotation. In the case of the earth, the opposing torque is very small compared to the inertia, so the rate of slowing is very small. This is mainly due to gravitational interaction with the moon, and it tells you how huge the inertia is that this effect is so small. Yes, there would be some specific forces resulting in a net torque that would set the forming earth into rotation, but it would have been a miracle if there weren't.

[@darrengreenspan]

KZbin let's recommend this a decade later

[@antonhelsgaun]

My thougth was/is that it started spinning at some point when it was created and there is just simply nothing to stop it

[@sykotikOG]

I really like the drunk guy you interviewed, lol. He's trying to get there!

[@timoaks9633]

So, how do we even know that the Earth is spinning to begin with?

[@user-lp7tx1fe6t]

Day/Night? Night sky? Gyroscopes? Hurricanes? Coriolis effect?