Centrifugal Force Does NOT Exist!!

[@skylorwilliams5036]

Feeling something might make it a real experience but that doesn’t make it a physical reality. One of the deepest things ever said.

[@Elie-J-Saoud]

oh yeaaaaaaaaaaaaa, deeply stupid,,

[@patrickmcleod111]

Skylor Williams Right, and if you jump from a tall building, it may seem that you are 'falling', but falling is not a real force. As mentioned in other centrifugal force videos, it helps if you view what's happening, from the same perspective. In other words, if you and I BOTH jumped from a tall building, it may 'seem' to spectators that we are both falling, but from your perspective after jumping from the roof with me, it would appear that I WASNT moving, and that I was motionless. That's the proper perspective BTW! That's why no one is ever injured when they fall from tall buildings, bridges or cliffs, because they aren't REALLY falling to begin with! See, doesn't that clear it all up? Lol

[@kirkhamandy]

Correct, no one has died from falling off a tall building. However, many have died due to extreme deceleration.

[@juniormynos9457]

Like hearing voices in your head

[@TheXalos]

@@kirkhamandy Brilliant!

[@jimmyleg5]

I got flung off a metal merry go round when I was a kid, and landed in a huge mud puddle. Big kids were spinning the thing faster and faster and wouldn't let us twerps off. I was getting sick, so just jumped off, and misjudged the landing. No one laughed or made fun of my spill, though they looked on with mouths open. I just got up and walked around covered in mud for the rest of the school day. I still vote to keep the dangerous merry go round.

[@wildmoon9850]

See? No harm, no foul. #bringbackthemerrygorounds

[@ThugByChoice]

jimmyleg5 as do I. There is no better way to solidify this concept at a young age.

[@Islandcitymedia]

calling it dangerous makes you a pussy. shit and you almost won the game of comments.

[@ahetzel9054]

I watched my friend break his ankle on a merry go round, dude said it was a wild ride, no regrets lol

[@MF175mp]

We had daily merry-go-round tournaments where you would lose when you fly out. Best thing for kids

[@geovannyaguirre4566]

merry go round should not be removed from parks. every kid should be given a helmet upon entrance to a park. later they can ram each other's heads with those helmets

[@ScienceAsylum]

Geovanny Aguirre Helmets! I like it!

[@tunnsie]

Geovanny Aguirre Made my day with that comment. 😂

[@Islandcitymedia]

nope let them play and strongest will survive fuck these fairy ass snowflakes oh no my kid pricked his finger. boo fucking hooo.

[@jeremynelson9339]

There is one at mine but it looks like a cage

[@DamnZodiak]

Helmets don't protect you from long term brain damage. Look at all the football players getting CTE now. en.wikipedia.org/wiki/List_of_NFL_players_with_chronic_traumatic_encephalopathy

[@ethancorrea5370]

I know this video came out 7 years ago, but you helped me understand and appreciate horizontal uniform circular motion more. Thank you very much!!

[@ScienceAsylum]

You're very welcome! 🤓

[@balakrishnan2398]

@@ScienceAsylum The man with the Science right here 😎😎🔥🔥🔥

[@DrDeuteron]

*10 years

[@worcesterexchange554]

What most people fail to explain properly is that although the ball (mass) on the end of the string appears to be trying to fly away in a line directly from the centre of rotation. If you cut the string it would not go in that direction. It would go at right angles to that direction. In other words it would continue in a straight line in the direction it was travelling, tangentially to the circle it was spinning in. This is because any mass continues in the direction in which it is travelling unless a force changes the direction. The force in the string, is the force needed to continually change the direction from a straight line to a circle.

[@ScienceAsylum]

+Worcester Exchange I approve this message.

[@worcesterexchange554]

Thanks Science Asylum.

[@daledorsett9791]

To me it is a play on words or perhaps a rewriting of science from the fast. Extraction of the word 'centrifugal force' to be consistent with the new mindset should be extracted from the dictionaries and science books and by the way the word centrifuge perhaps be called inertiafuge. People that understand the words meaning have never had problem with the word. Splitting hairs is the way I view it, though the focal point is upon centripetal force rather than the opposite centrifugal force. The dispute is upon 'force'. When you design a bride you factor in potential forces and stresses on the bridge to evaluate how to make it be able to handle the projected loads. Personally, even if centripetal is more accurate - if - the elimination of the counter forces is probably inserted by some intellectual pin head to create a name for him/herself, or even inserted to complicate matters. Who knows why?

[@lonelycubicle]

Thanks for the point about cutting the string, makes total sense.

[@yul2033]

I'm not sure if it's related bit, can anyone explainme why a bug can fly índice a car without hitting the back window?

[@craigschaffert]

"Some of the best stuff in life can cause temporary pain" -Nick Lucid

[@williammorton8555]

10 years later and it's still good

[@ScienceAsylum]

You really think so? I cringe when I rewatch this older stuff.

[@reisbayer4391]

@@ScienceAsylum this is the first and (until now) only video i watched from you (gonna check out your channel after my comment), because i wanted an explanation why it doesnt exist, after getting back into Kerbal Space Program. And your video, while a bit over the top, explains it really well imo and honestly, id rather have this kind of, bit exaggerated, explanation style, than someone being monotone like school teachers xD

[@grahamgleed9040]

Merry-go-rounds are cool. It just needs a politician to give them a bit of positive spin.

[@braedonvangorkom3308]

haha nice

[@Zeegoku1007]

Lul 😁

[@vasillivogiatzis4910]

Are you a dad? I feel like you're a dad.

[@katrinaelizabeth7678]

Haha I get it LOL XD

[@force10guy26]

#CommentOfTheDay

[@kimhulley3594]

merry go rounds were part of my childhood! We quickly learned the hard way where to sit!!!!

[@johnnorman7676]

never would have guessed but uniform circular motion is one of the most mind bending concepts ive found in physics yet

[@dustinh4175]

It's gotta be repetitive

[@CAGESYLER1970]

lol... ON, OFF, ON, OFF, ON, OFF the merry-go-round. Great presentation dude. Super entertaining and comprehensively educational. Preesh...

[@ScienceAsylum]

Cage Syler Thanks!

[@carl9931]

Perfect explanation of centripetal force. I was trying to figure out centripetal and centrifugal force for flight lesson, and putting it in layman's terms was extremely helpful. Thanks!

[@ScienceAsylum]

You're welcome!

[@pintificate]

Nice visual presentation, but it contains a number of errors and imprecisions. The pendulum ball moving towards the back of the car is _not_ an illusion, it really does - relative to the car. It tries to remain where it was before the acceleration, for the same reason the driver feels himself being pushed back into the seat. Next error, the backward "movement" of the pendulum will also be visible to an observer standing "stationary" beside the car, so the observation is not restricted to the occupant/s of the car. Inertia and momentum are the _same_ force - very real - as all movement can only be discerned relative to another object. That's on the intellectual level, but we humans _can_ and _do_ feel acceleration. That ball attached to the rim-rail of the merry-go-round (once in Australia a whirligig) does not just _appear_ to swing outward, it actually does! You can see it! It's attempting to remain inert. And this too _is_ visible to an observer who is "off of" the merry-go-round. And the feeling of being pushed toward the rim of the rotatatron is REAL, because it is actually happening. The radial force ends at the periphery, then it becomes a linear tangent. Apart from all that, the visuals were good. .

[@revincentiii]

I am using your videos in my classroom as an introduction. The students enjoy the jocularity that accompanies the lesson.

[@ScienceAsylum]

+Robin Vincent It's nice to hear they're appreciated :-)

[@littlesnowflakepunk855]

Centrifugal force is a term used to describe the reaction of an object which is not attached to, but is being acted on by, the angular momentum of a different object. The object, if bound to the rotating object by, say, a string, moves away from the center due to what we call centrifugal force (the angular momentum tangental to the second object's rotation, but not strictly bound by the second object's axis) Hence, objects appear to move away from the center when in fact they are moving in tangent to their rotation. Centrifugal force does exist, but it has more to do with momentum than force, and it does not exist precisely as described.

[@IvanAlarflying]

completely true

[@ferdinandoinsalata3949]

Alexander Ceja no this is a reactive centrifigal force, not the fictitious centrifugal force

[@robosergTV]

wow, best explanation. Thx for your effort doing this

[@keilahvanhees3895]

Thank you for making this explanation simple. My dad and I really appreciate it! My vote is to keep the “dangerous” merry-go-round for children to play on. They are fun, and a little temporary pain is good😁

[@dillongrannis8279]

My parents died in an merry-go-round accident a year before I was born so I never met them. I vote against merry-go-rounds.

[@springinfialta106]

In my day the different parks in my area were competing to get bigger and bigger merry-go-rounds. There was a real monster at one park that I can still remember. We used to get it going real fast and then walk around the outside and try to push each other off. Great fun was had by all.

[@LastBastian]

I've yet to find an explanation of this that actually makes sense to me. 😵‍💫

[@gay5535]

Awesome explanation! It sort of clicked when you said that what you actually feel is the response to the centripetal force and not a force in and by itself. 😍😍

[@ScienceAsylum]

Glad I could help a little 🤓

[@ricknoah9184]

Heck, I always thought kids breaking a few bones growing up was normal, but then, I'm over 70. We were allowed to exercise "stupid" to our hearts content. Most of us had a pretty good understanding of physics learned by doing everything the hard way. "Hold my Kool-aide"

[@beebala3758]

The merry go round reference is amazing, thank you so much!!

[@yunged]

This is by far the clearest explanation of this, well done mate :-)

[@ScienceAsylum]

yunged Thanks.

[@eleneasy]

Just left you a comment in the recent video on the flow of current, and then saw the comment of someone else mentioning this video. I had to check it out and I was right! You are really the first person in all KZbin videos I saw that states correctly that centrifugal force does not exist! Thatnk you so much for making these videos! People needs to have someone like you that truly understands physics and finds the way to explaining it having fun.

[@franksmith9027]

But a centrifugal force does exist, just ask Newton, thus when you swing a ball on a string the ball "EXERTS" a centrifugal force on your hand which you can feel and measure.

[@briancouey5464]

Love your parting comment "its okay to be a little crazy" I find the most brilliant things I hear or see are from raving lunatics they all have one little piece of Super Genius

[@regnorakw8018]

Great Video man!!!! A girl in my descriptive physics class recommended this to our professor, so I decided to watch it and really enjoyed the content. Thanks!!!

[@ScienceAsylum]

You're welcome! Thanks for watching! ...it's nice to know people are spreading my channel :-)

[@willoughbykrenzteinburg]

I thought from your title that you were going to denounce centrifugal force as a concept that should be disregarded and never used. My prejudice was unfounded. Great video. Great explanation. I just think the title is misleading a little bit.

[@japeking1]

Used to be the best senior physics class of the year...the trip ( 200m trip ) to the playpark and experiment with the roundabout.... 3 kids (big kids) haul themselves towards the centre.... no way can the 4th hang on....conservation of angular momentum can be dangerous. They took the roundabout away and I retired. Quite miss it.

[@Xaminn]

Thanks Nick! As always, very informative and enjoyable.

[@6b14yeungsinchun-8]

The direction of the friction between the merry go round and the butt is wrong, The friction acting on the butt is towards the motion of the merry go round, and the friction acting on the merry go round is the opposite. For anyone doesn't understand, think of two boxes that are in contact, one on the top of the other, moving towards right together, then the friction acting on the top object is towards right, the bottom object, and the friction acting on the bottom object is the opposite.

[@willoughbykrenzteinburg]

Friction always acts in the opposite direction of motion.

[@6b14yeungsinchun-8]

@@willoughbykrenzteinburg physics.stackexchange.com/questions/137634/direction-of-friction-force-between-two-boxes Friction always want to try to keep to object together, if only the bottom object is dragged, the upper object must be dragged by a friction to the right to maintain its position relative to the bottom object.

[@StarksDummy]

Great video! After all of the videos I've watched I finally understand it. Personally I hate the Puke go Rounds for that reason but they need to quit trying to make things safer for kids. They'll find another way to hurt themselves.

[@imanabusara4134]

The only physics teacher to make me laugh ! I have been struggling with this concept for a long time now, but finally my head is clear once and for all and I finaly understand the difference between the two forces

[@florian7947]

*one force and one "feeling" ;P

[@qpwoeirutyeidjcn8673]

Clear, concise and funny. Thanks.

[@ScienceAsylum]

qpwoeiruty eidjcn You're welcome. Thanks for watching :-)

[@bettyanngoldhammer-ellers3011]

Excellent. Thank you. Finally found a video that explains centrif. v. centrip. in a way that a regular human can understand. Now I've gotta go look for more vids by The Science Asylum and see if they are likewise comprehensible.

[@J.D.Boomhauer]

Maybe three years too late, but merry-go-rounds should be installed everywhere!

[@andrehuellstrung8635]

You are hilarious and very correct! My Physics students are gonna luv you! And I agree, we should definitely keep the old merry-go-rounds on the playground

[@tjakal]

I had a friend, monstrously strong for his tender age, I don't know what RPM he created on that merry go round but it was one of the most physically abusive and painful events from my childhood, puked many times. We rode it like 2-3 times a week, always a blast to see who could hold on the longest. Sad to see them go. I can understand the drive to pussify kids though, sometimes I feel my generation was the last one raised to survive the aftermath of nuclear war or something.

[@ScienceAsylum]

tjakal Philosophies for raising kids will change again. They always change.

[@SteelyEyedH]

Lets just hope it changes before said nuclear war then ;)

[@tabitharosefreeman1793]

😂😂

[@ronaldm.6150]

Watch your language

[@wetterschneider]

Pretty sure it's not the flying off that's the problem with the design. It was how many kids got a limb caught underneath and twisted to breaking.

[@benphillips66]

You just murdered me. You’ve just undone some fundamental concepts here. I need more discussion of the pendulum effect in an accelerating car not being the force from acceleration, and a bit more on centripetal force and....

[@adammarkiewicz3375]

For you sitting in the car the pendulum seems like some force is pushing it towards back of the car. This isn't truth: it is the car pushing itself and everything inside forwards. Pendulum just follows the string holding it, while the roof accelerates forwards.

[@landlockedviking]

your right, it's kind of like Mr. Peach said, " crazy is like prune juice, a little bit is good, but too much....."

[@Captain-Cardboard]

This video has made me want to re-watch all the footage of people on merry-go-rounds that have been revved up by motorbikes!

[@skynetreboot8239]

My heart broke learning about the merry go rounds

[@manuelcheta]

Easy to understand and also fun. Well done :D

[@ss_whole]

Fun Fact: This comment doesn't exist, you only think you're reading it but you're not, what you see is your response to seeing it, not comment itself

[@dustinh4175]

Ahh the old one comment two comment experiment

[@rojinksunny9907]

dude ,you are awesome...you did something my brother's were trying for hours to do

[@bonnieswanson4404]

Love it! DOn't remove the merry-go-rounds!

[@SceneoftheCrymes]

Excellent job! I've added this video to all of my future centripetal force lectures. Thank you!

[@ScienceAsylum]

+Jonathan Crymes I love hearing that my videos gets used in classes :-)

[@RyuichiNoGekido]

Makes me sad, merry-go-rounds were a blast.

[@Trp44]

Nick Lucid, you're best science guy talking.🧤

[@jayphilipwilliams]

What I like to say is that what most people think of as centrifugal force is simply a combination of centripetal force and inertia. Love the comments about child safety. Maddening about our modern society, though. Thank you, attorneys!

[@DrChadJohnson]

Just so y'all know, Devil's Tower in Wyoming has a KOA right next to it, and it has a merry-go-round (as of summer 2014).

[@DeeRanged925]

you did a better job explaining this than any of my science teachers

[@ohaRega]

great vid! about the merry go round thing, i don't like the idea of removing them, but i'd actually support them making it safer. it's really easy to get seriously injured if you're on a particularly courageous day. i've had my share of the hell-born wrath of the rotating metal bars. (doesn't feel great to witness a friend break their arm :D)

[@ScienceAsylum]

+ohaRega Anytime we do merry-go-round stuff, the cameras are firmly attached and there's always more than one person around. Safety first.

[@DelfinoGarza77]

Bring merry go rounds back...some how.

[@justblaze4707]

Well. That's that. I just comprehended this topic in about 4 minutes after 2 weeks of acting like i knew what was going on for a week and a half. Many thanks!

[@ScienceAsylum]

You're welcome!

[@trevorstrickland6754]

THANK YOU!!!!!!!!!!!!!!!!!!!!

[@dhonzik]

1:58 that explains why the lyrics in,This Kiss by Faith Hill is Centrifugal motion, she mispronounce the word when she sings it.

[@ScienceAsylum]

Yep.

[@pwnmeisterage]

The only safe playground is a sandbox! With bubble-wrapped rounded rubber edges and non-toxic non-carcinogenic hypo-allergenic sugar-free eco-green-friendly sand.

[@humblehedwig]

How is the force that renders the pendulum in the car to swing backward or which pushes one back into the car seat "fictitious" when it's the same force (combined with gravity) that affects astronauts on board a space shuttle traversing the atmosphere up into space???

[@learnerlearns]

Love this video! Everything about it is correct, EXCEPT for the pronunciation of Centrifugal, which has only recently changed ( within 50 years). Merry-go-round question? Agreed: some educational experiences are temporarily painful, Playground mishaps included. The REAL reason those are changing is because of goddamned lawyers and insurance companies.

[@samyakmarathe3434]

What a great and humorous teacher

[@YouCrapToo]

Earth is flat like a pancake.

[@alexsnowberg2181]

Is this pancake on a plate?

[@esnare9138]

your a very good example for science! i am doing a science project right now and ur helping alot!

[@ScienceAsylum]

Tori Bove Glad I could help!

[@calvinhulburt9188]

If you are trying to learn physics give this one a skip. Mr. Lucid doesn't recognize the difference between an inertial force and a fictitious force. His is the Natural Philosophy of Aristotle before Galileo became aware of inertia. An inertial force is the resistance to acceleration and so always points in the opposite direction. A metal ball going in a circle is constantly accelerating toward the center because of the constant change in the direction of the velocity. A resisting force, the centrifugal force, points to the outside. This is a second order real force. Fictitious forces do not exist and are only used to calculate the path of a object from an accelerating reference frame. This is a small and unimportant idea but scammers like this guy try to use it to fool kids to think he is physics smart.

[@modeldaughters]

Calvin Hulburt I'm not familiar with a second order real force. Is this something real I can find out more about or are you generalizing or ? No sarcasm here at all. I'm trying to grapple with the coriolis effect and being told it's not real because it doesn't happen in all frames of reference. Specifically with regard to storm systems that rotate CCW in the northern hemisphere and CW in the southern. Being told the rotation is a fictitious force doesn't bother me (in the sense that it's not being called non-existent, it's simply being labeled differently). What troubles me is when I'm told that because centrifugal force doesn't exist neither does the coriolis effect and therefore the rotation isn't real... WTF?! In the frame of reference sense it's true that if I travel in a circular reference frame at the same speed as the hurricane I don't see the rotation, but there's definitely something going on (either kinetic or otherwise, and my understanding of inertia in a system like this would be that inertia is kinetic centrifugal energy opposite to centripedal potential energy ?). I hope that made some some sense? I'm not a physicist - obviously.

[@calvinhulburt9188]

Your confusion and distrust are only due to being told bullshit physics. Any acceleration will be part of an inertial force. This is a real force. To understand how this has come about google Newton's second law. You are likely to come up with a false expression that states "Newtons second law can formally be stated as:" Following this will be a statement that is true but not his law as his law was formally stated as F= dP/dt with vector notation. Their statement is half of what Newton said. The truth is we have two forces in balance and the second term is the inertial force. This is physical reality and you can prove the truth of it in many ways. With coriolis acceleration you will have a force that will contain two velocities that act as an acceleration. Reference frame arguments are largely bullshit. The reference frame is the choice of the person doing the analysis and not the object undergoing acceleration. A linkage undergoing a coriolis acceleration will come apart due to the load no matter what frame you choose. These arguments happen because having failed at step one with Newton's law the physics crowd is constantly trying to invent ways to cover for the real outcome that occurs. As a retired engineer who had to determine loads on dynamics systems I feel the bad information being fed to the unsuspecting is making physics way too hard. You cannot come to understand what is false. I have confronted the idea of this definition of the second law and the false notion that centrifugal force doesn't exist. It is amazing how these people squirm and try to change the subject or spin the argument into some complex frame or redefine what fictional force means. Their understanding is shallow and bars their arguments from reality. I am currently writing an article that is becoming a book on this subject and may soon do a video.

[@modeldaughters]

Calvin Hulburt Thanks, I look forward to your video. Is there a beginner's physics book that has it right you'd recommend? I hadn't planned on getting to heavy into it but in case you haven't noticed, though it sounds like you have, the first world is dumbing down in extreme ways. The unbelievable things people come up with make it really hard to study anything fringe because that's where we've always needed a whacko strainer and now - geez it's like trying to find a special piece of hay in a haystack. Thanks again, I always breath a sigh of relief when I run into someone from my own era of career. My field was software. Cheers.

[@calvinhulburt9188]

I studied physics from Halliday and Resnik, Spelling may be wrong. While good, I found that like most texts they are geared toward solving problems and avoid questions of physical reality. It was in Engineering that I came to understand how inertial forces are simply forces. When you solve systems of differential equations it becomes obvious. There are a few videos about what I am coming to call intuitive physics. Rather than rely on mathematical arguments people are describing what physically causes gyroscopes to precess. Thanks for the support and best of luck.

[@calvinhulburt9188]

To understand centrifugal force consider how Newton's second law applies. There is a string providing a centripetal force which is balanced by the inertial force of an accelerating mass. This is the centrifugal force. For there to be tension in a string there must be a force either end. Forces act in opposition. The mass is force free when traveling in a straight line and exerts a force when it is not. Once the string is cut the mass flies off but at this point there is neither force. Inertial forces exist if there is an acceleration. To point to the behavior when the force doesn't exist is misdirection.

[@ScienceAsylum]

StormBear: "The force acting on the steel ball is the same acting on the human." You mean the tension? I don't see how there's a tension on the person.

[@sabzi5858]

***** The centripetal portion of the tension force is the equivalent of the friction force acting on the human. The forces would clearly have different magnitudes as they are causing similar acceleration to vastly different masses, but they would be in the same direction. I think that's what Storm Williams may have been getting at. I will agree with him in one point, while the rest of your presentation is quite good, your attempt to explain the reason we "feel" centrifugal force was incorrect. The force of friction applied in response by the sitter is felt by the merry-go-round, it cannot, therefore be felt by the sitter. To understand why we feel this force, we must understand that humans are not solid objects, we have different compartments with varying densities. In our inner ears, there are small components called otoliths that are a part of the vestibular system. These structures resemble springy hairs with little rocks at the end, basically a spring with a mass attached. When an external force causes out body to accelerate, such as a merry-go-round inducing centripetal acceleration, the force is applied to the external portion of our body, which must therefore apply a similar force (in direction) to the inner parts of our body. Because our body applies this force to a mass suspended by a spring, that spring bends, and when it does, this triggers a chemical cascade that results in neural impulses that tell our brain we are accelerating. Additionally, because our centripetally accelerating body is applying a like force to our internal fluids, such as our blood, these internal fluids must apply a force in the opposite direction, applying a centrifugal force against our body, which we feel. That brings up another point; although centrifugal force typically is used to describe a fictitious force, it may also be used to apply to a real force, namely the force opposite and equal to centripetal force which is applied by the centripetally accelerated body against the body causing said acceleration. The friction applied by the sitter to the merry-go-round as well as the internal fluids of the body applying force to the inside of the body in this scenario are both examples of real centrifugal force.

[@ScienceAsylum]

sabzi5858 You are correct that there is a lot more going on inside the body related to our many senses, but that's a lot of biological detail that I felt would have unnecessarily over-complicated the explanation. It would be like talking about the inner-workings of a car engine when you're trying to explain how a car moves forward. Although correct and complete, it's completely unnecessary. Saying "a car moves due to friction from the road on the tires" is plenty detailed enough for the average person. As for centrifugal forces sometimes being real... if you take the word "centrifugal" only literally as "center fleeing," then yes you are correct. Unfortunately, as an educator, I have to consider more than just definitions. I have to consider what *my audience* is going to think when they hear certain words. If you say centrifugal forces do exist, (for many of them) it will only serve to reinforce their preconceived notion that the centrifugal force acts on their whole body. That's what makes physics so hard to teach. You have to break down everyone's preconceptions first.

[@sabzi5858]

I agree that the detail I went into was unnecessary for the casual viewer. However, the point is that we don't feel the force that we apply to another object. In the centripetal force application, what we feel is still the force being applied to us, and the reason we feel it is because it is applied to us unequally. In free-fall, we feel nothing; if we view gravity as a force, it applies equally to all parts of our body, so we don't feel it. The same would hold true if we could evenly distribute electrical charge throughout our body and then apply a force with an electric field. This doesn't change the fact that what we feel is still a force being applied to us, and not a force we are applying externally. I understand that your audience may misinterpret the word centrifugal, however, as an educator, I would think you would want to be clarifying these terms, and not pretending they don't exist. I watched your artificial gravity video and you addressed it there just fine. As a student, we are taught things repeatedly and then repeatedly told oh, that wasn't quite true. It causes confusion in many people. I know some of your audience includes premedical students trying to study for the MCAT, as well as students studying for other life-deciding exams, and it can make a big difference for these students to understand concepts they find to be extremely difficult. Over-simplification results in these students lacking understanding and trying to memorize their way through these problems and that usually doesn't end well. Confusing definitions of words isn't helpful and causes students to guess incorrectly.

[@ScienceAsylum]

sabzi5858 Yes, the current educational... uh, paradigm, maybe?... is to give students the illusion they have a complete picture of things after an introductory course and then just tweak that picture in little bits as they go on to learn more. It prevents student from feeling overwhelmed with the massive amount of knowledge that lay before them. It makes the amount look smaller and more approachable.

[@Tricknologyinc]

It is most certainly felt by the sitter in the pressure against the parts of their body that are in contact with the parts of the merry-go-round they are using to counter the force. If you are sitting inside the bars and resting against them, the force of friction under you is shifted, and the parts of your body with higher centers of gravity, that rest against the bars apply a force there which sums into the total force applied and resisted. If there were no bars, all of the force would depend on the contact friction, and tension in the muscles would only represent the connection between our soft body parts, our hinged frame, and the friction that is the sole force that our body then distributes to it's otherwise loose parts. EVERY part of everything moving in a circle, "feels" the force of that mass against the connecting mass that joins it to the rotating body. Hope I didn't confuse ya! In other words any part of the merry-go-round that has mass, and every part of everything on it, feels the force of it's mass against whatever is holding it in it's location on it.

[@rnilu86]

When I studied Physics in school, there was no KZbin. Sometimes it was hard to wrap your head around the diagrams which showed only components of force.

[@Kevin-gm6mt]

The link you put in the description to Sci Show video was a lot more clear and easier to understand.

[@ScienceAsylum]

Kevin Fernando That's because the SciShow video didn't really explain anything.

[@Sezstu]

As a kid I liked swings with wooden seats that you could fly off of trying for distance. I had some awareness of safety and didn't do this on concrete or blacktop.

[@karlswanson95]

I have a commercial washing machine. When load is unbalanced it is clearly causing an periodic upward thrust and would be jumping if the machine where not bolted to the ground (Infinite inertia, immobile). In this case it does not go anywhere because the point of rotation is immobile. If we have a fluid flow in a circular path where the cross sectional area is significantly reduce on half of the circular path there would be an imbalance and if it were on a track that prevented rotation then the device would have a constant net positive force in the direction of the restriction. In this case the central point is not immobile.

[@fmp1976]

Great video. You are awesome. Will share with students.

[@phoneyphil5663]

It's 4am and I'm watching this video to make sense of ONE scene in Festival of Champions

[@haleyhoag8640]

Really good explanation. Also I love merry go rounds and I hate the fact that they are getting rid of them.

[@mikeflippin5568]

Great video, subscribed. I hope all of your videos are this goofy and informative, and I DO have a pendulum hanging in my car. =]

[@ScienceAsylum]

Most of them are.... goofy I mean.

[@aadhavjaimurugesh2734]

Merry-go-rounds are the best... Your video was the best...

[@joselinjose6786]

wonderful illustrations

[@matijapongracic4812]

Perfectly summerized. One thing I have to disagree with is calling the "inward" force centripetal in a non-inertial frame. Centripetal force is the one causing the centripetal acceleration and since in the non-inertial frame the ball doesn't have any acceleration, there's no centripetal force, even though it is the same force that we are allowed to call centripetal in an inertial frame. To sum up, centripetal and centrifugal force can never appear in the same frame of reference. If tension of the rope acts as the centripetal force from the outside, from the inside you can't call it centripetal, instead you should just say it's tension of the rope opposing the centrifugal force

[@Watermeba]

From the outside perspective, is it fair to say that the frictional force the merry go round exerts on you is what accelerates you towards the center and hence makes you move in a circular path?

[@ScienceAsylum]

Yes. Exactly correct.

[@AdityaPandey-ns8kl]

you are bloody amazing, seems many don't realize

[@nooneatall5612]

Dammit, I saw this video, I knew the stuff already, I knew that I knew it(YOOHOOO feels good to understand something before getting my ass handed over to me for once!), but it didnt matter, your videos are so entertaining I just came for that, and boi was I NOT disapointed, you are awesome! Keep up the epic work!

[@katrinaelizabeth7678]

*Thank you for giving me permission to be crazy. I’ll need it*

[@krishnasrinivasan7541]

Very clear explanation and a fun video! Thank you.

[@ScienceAsylum]

You're welcome!

[@sphakamisozondi]

0:38, I dont know if it's me, but, that pendulum seems to be attracted to you, Nick. LITERALLY!

[@piyush2404]

Force of attraction by "Love" Is the 5th fundamental force of nature I guess

[@huskerinillinois]

this entire video makes absolutely no freakin' sense to me whatsoever.

[@mikewellwood1412]

They got rid of that sort of merry-go-round (we called them roundabouts) years ago here in the UK. A great pity, I always thought. And I haven't seen any modern, "safe" replacements. I do remember our physics teacher in the 6th form insisting there was no such thing as centrifugal force, only centripetal force. He didn't explain it all that well though.

[@fariahaslam9095]

"Its okay to be a little crazy" thank you that really helped my depression 😣😊

[@marissakristine9257]

It's pathetic that I am a junior in college (social science) and I don't recall learning this. Thank you for making am easy to understand video.

[@ScienceAsylum]

+Marissa Olvera Glad you liked it!

[@adamcornfield6695]

You realize that the the ball thing is going out words to the center, hey, whats making that spin outwards, oh yeah... centrifugal force.

[@questionall3667]

The acceleration "toward the centre" has to be incorrect. Surely there is no point at any stage, spinning or stationary, that the stringed ball would pass the 90 deg downward position so as the string and ball are angled at the opposite angle that we see when the merry-go-round is moving?

[@Moataz_Emam]

Brilliant I am showing this in my classical mechanics class today :-)

[@ScienceAsylum]

***** I love it when people tweet pictures at me from class. It's nice to know the videos are useful.

[@Vastafari34]

can you PLEASE revisit this in a longer more detailed video. I am VERY close to understanding it with just this, but if you could embellish a little bit more, I think I would get it totally!

[@ScienceAsylum]

Not sure when I'll get back around to rotation, but I do have a playlist of old shorter videos like this one: kzbin.info/aero/PLOVL_fPox2K9MAkeRJ_vzOGnwo5J-94-m

[@timelinedifferential6787]

I agree they shouldn't remove merry go rounds. I went on them as a kid and they were fun. I once got off one too fast and tripped but it didn't hurt that long. How fast can they move anyways? Not very as they are being pushed by human muscle. A few miles an hour and that isn't going to kill you or even hurt you very much.

[@ferdinandoinsalata3949]

Hi great video! one question, if I am in the spinning system, I feel pushed. You say that it is because I am feeling my reaction to the friction of the merry-go-round, which is the centripetal force which keeps me spinning. But I am applying the reaction on the merry-go-round. How can I feel a force I am applying?

[@ScienceAsylum]

Most of the things we feel come from inside our bodies. You're trying to go in a straight line (because inertia), while the inward friction (centripetal force) from the merry-go-round keeps you going in a circle. This puts tension on your skin and muscles as they work to hold your body together. Your brain interprets that as an outward force since an outward force would cause the same thing to happen to your skin and muscles.

[@ferdinandoinsalata3949]

The Science Asylum It makes sense, thanks

[@nitink9879]

Accelerating frame of reference is also called non inertial frame of reference.Centrifugal force is an imagination. It is a pseudo force used for convention in non inertial frame of reference. It acts opposite to the direction of centripetal force at every instant of time. In the absence of centripetal force, 1)In non inertial frame of reference (Newton's laws not valid here), the body APPEARS TO move radially away from the centre because of the centrifugal force . 2)In inertial frame of reference (true frame of reference) , the body is spiralling outwards.At every instant of time,the direction of motion of the body is tangential to its circular path.On overall,the body is moving in a spiral path of increasing radius.(This is similar to differentiation-integration). Note:- 1)Centrifugal force is a PSUEDO FORCE and is not a force of reaction.Action - reaction pairs of forces do not act in the same object. 2)Pseudo force as the name suggests is not real but used for convention in non inertial frame of reference. Pseudo force exist in one frame (non-inertial frame) but not in the other (inertial frame). Also,two different accelerating (non-inertial frames) have different psuedo forces and different acceleration.Also, in a given single non-inertial frame ,different objects experience different pseudo forces,since they have different mass,but have same (equal) acceleration.

[@nitink9879]

Don't reply please I am speaking to myself.

[@redfishonfly58]

Centrifugal force is a false force as explained in the video. The ball suspended from the merry-go-round by a string will follow Newton's first law, which states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. The external force, causing the ball to not follow a straight line, in this case is the centripetal force exerted by the string. "Centrifugal force" is a misinterpretation of inertia, therefore a false force.

[@brendan8363]

Great job with this! Thanks!

[@PHYSICSEVERYWHERE]

Thanks for the video. Really good information!

[@lomoDaniel]

Great content, subscribed after watching this video. Only critique I have has to do with the speed of delivery. My son finds it difficult to keep up and he sometimes misses important aspects of the theory.

[@ScienceAsylum]

I agree. My older videos are _way_ too fast. This video is 5 years old. I'm much better about pace in my newer videos.

[@bellefrancaise]

I like the facial expression of the accelerating character! great video

[@bellefrancaise]

oh, and yea all the best rides in parks are no longer, such as the wooden teeter totters

[@guilhermefreire8093]

Thanks. Amazing explanation

[@maiwandmomand9989]

Well explained, thanks!

[@jamesmatheson9624]

The purpose of centrifugal force is a outer ring moves a ball and the center moves with less gravity so you can control gravity by making the ring move the ball And if you speed up or slow down the ball the centre gravtiy changes And if you add more rings with balls the center and outer gravtiy changes