We made quiz questions to help you review the content in this episode! Find them on the free Crash Course App! Download it here for Apple Devices: apple.co/3d4eyZo Download it here for Android Devices: bit.ly/3TW06aP
These physics videos make me appreciate it so much more! Thank you, crash course, for helping tons of students not only learn but actually like the subjects taught to us.
I cannot believe how WELL this series is able to connect everything. From episode to episode, I've been able to put all these abstract concepts in my head together. This one was the definition of pressure. Thank you. I have a final tomorrow and barring my awful math skills and the teacher's insistence on that we must be tricked at all times, I feel -conceptually- ready.
You should do Crash Course computers (computer science) and Crash Course electronics as theese are some of the most important industries out there. I think that a CC computers and a cc electronics would inspire young people to pursue a career in the two fields, and show them that it's easier than you'd imagine.
Chow Tom LOLOLOL I took my first high level Chemistry course 4 years ago, and have had multiple higher level courses since then, like Drug Pathophysiology, where we talk about how medicines move through the body, what properties they have that make them bind to receptors in the body and stuff. If anything, that makes me more salty. By the way, no disrespect to you with all the lol's, I'm just wiping the salt off my face because I was just one year too early to have this stuff when I needed it the most.
when i was around 13 ( i'm a 16 y.o romanian boy ) i've learned in school the boyant force..called here archimedes force, and when i asked the teacher if always the same percentage of an iceberg remains under water (it's about 90 percent and she said yes ) i had some sort of a smaller eureka moment :)). that day i made a formula of what percentage of a body's volume remains under water, and it was the body's density divided by the fluids density and multiplied by 100 ( if the percentage is bigger then 100 it obviously sinks ). when i showed it to the teacher she took a brief look, and said it's completely wrong, she didn't like me that much. it's so bad to have dumb teachers..but gladly we have crashcourse now! :))
i spent 2 hours trying to solve a physics problem and failed. 2 mins into this video and I solved it. Thanks for making me feel bad about paying for my tuition. :)
Hey Crash Course you're doing an incredible job! Keep going!!! What about doing a CRASH COURSE MUSIC?? For example, teaching us how to read music or the different music genres and their characteristics, such as Rhythm or their harmonies or even their history.I really think it would be a very great idea :)
I found that the most fascinating application of Archimedes' principle is the Falkirk Wheel in Scotland. Plus, there's a whole lot of interesting physics behind it, anyway.
Since you have done a crash course on astronomy and on Classical Physics could you do one on Quantum Mechanics??I know that you have a couple of videos on nuclear physics for crash course chemistry but a whole series dedicated to quantum mechanics,nuclear physics and fundamental particles would be extremely interesting.
I am not sure if lessons should be delivered with such speed. Students who just started learning about pressure will probably be lost at the latter part.
+Darius Niederer He was apparently killed by a roman soldier after they had attacked his home city. The roman commander knew how smart he was and wanted him alive but when the soldier told him to come with him he told him not to disturb the calcu ations he was drawing in the sand. He was promtly struck down. Apparently he had previously also designed war machines to help defend Syracause although some of them like ship-burning mirrors seem to belong to fiction,
I remembered diving to the bottom of a 16 foot deep pool once and it hurt like crazy. I just worked it out and apparently it was only a pressure of about 1.5 atmospheres or ~150 kilopascals. Not nearly as much as I thought it would be based on how it felt. Shows just how sensitive people are to pressure changes. Though I'm sure it would have helped if I popped my eardrums by blowing out with my nose plugged.
I have to say, I could not be more thankful for Crash Course Physics. With the beautiful and helpful graphics and impeccable writing, this series and everyone who worked on it is what is keeping me at an A+ in Physics for Bio Majors
"Thanks to Archimedes, we know why objects float and sink." 8:37 Isn't it more accurate to say that since Archimedes, we know HOW they float and sink, but not WHY? It seems to me that the terminology used to explain the differences in forces is Newtonian physics rather than classical physics. Don't want to nitpick though, I love this series!
Thank you! We've learned at school about Archimede's principle and I managed to do pretty well, but it was something weird about it that just made me think it wasn't intuitive at all ! After I watched your video something just clicked in my mind and now it seems very simple and logical to me ! I know this sounds pretty generic and you get these kinds of comments every day, but I just wanted to say it was an eye opener for me! ☺
I have a question about the last case she talked about the ball being halfway in the water, yes forces cancel out but why is that? is it because of the density of the material the ball is made of that is equal to the water's or is it something else?
AFAIR from my course in Control and Automation Engineering, m/v is not density but specific mass; density is the specific mass of a fluid in relation to the specific mass of water, whic is 1. :T
Shini is so beyond beautiful, I now know what "lost in your eyes" means. I have to watch it twice just to catch it all, First time for everything. Femininity incarnate
4:00 y0u left 0ut a key feature in that the f0rce and distance m0ved are inversely related. s0 in y0ur example, it "d0ubled the f0rce which means it w0uld m0ve "half the distance. s0 if y0u m0ved 2in 0n the input, it w0uld 0nly m0ve 1in 0n the 0utput.... s0 its d0uble the f0rce but in half the distance. the same equati0ns apply t0 pulleys (I believe).
Watching this as I study for the MCAT. Great over views of the things I read. Very thorough. Sometimes a bit fast but that's what rewind is for ^_^. Thank-you for posting these. Physics and fluids are by far my worst subject
So, force of gravity on ball depends on mass, and force of buoyancy depends on volume. I have a question. Imagine a cylinder which height is greater than its diameter (so it's a thin cylinder). First it is placed horizontally on the water, then it is placed vertically in the water. Since buoyancy is the resultant force from a difference in pressure, can I conclude that the cylinder in the second situation experiences a larger buoyancy force than that of the first situation because of its orientation?
Content table Fluid at rest Pascal's principle Manometer's and barometer Archimede's principle Buoyant force (Pressure on water at bottom greater than water at the top)
But putting an object in a liquid doesn't really increase the liquid's volume at all, it just pushes an equal volume of liquid to its own volume aside, displacing it. That's why by putting the crown in a bowl of water that's filled to the brim and then measuring the volume of the water that is displaced and runs over the edge, you can find the crowns volume. So to reiterate, no increase, just displacement.
I keep waiting for them to stop making mistakes like this. It seems like they don't have any actual TEACHERS consulting on this. This "seems" like such a silly distinction to a scientist with a masters or doctorate, but it's a fundamental misconception and they explained it in a way that will perpetuate that misconception!
Sorry about that. I'll have a closer look at it and talk to our consultants (who are teachers of varying grade levels) and see if we should annotate that or something. This is one of the most difficult parts of video, in that, if something slips through, it's much harder to fix. Whereas in a lecture, you can just step back and say, "Oh whoops, what I mean is this..." - Nick J.
Just 2 more months and I never have to think of this confusing stuff again. I understand the basic stuff that we learn in elementary school but when it gets more complicated and I try to apply it, it makes no sense.
If the Bernulli equation is solved, the final pressure (P) is equal to the initial pressure (Po) plus ¡ 2 times ! the density (times the acceleration constant by gravity) (times the difference in fluid heights) !! P = Po + 2gΔh !!! Thanks for the video is very useful
what gets conserved when you use a hydraulic lift? Its cool that you can magnify your force, but has to come at a cost? Intuition says work(energy) has to be conserved, but I don't see how.
8 лет назад
You're right, it's work, of course neglecting friction. And you can see it by another conserved quantity, the volume displaced. That volume would be Area x Distance. As Area=Force/Pressure, and Pressure is the same according to Pascal's principle, you have that Force x Distance is also conserved, and that is work.
Does Pascal's Principle actually happen instantaneously? Conceptually it is the molecules of the object you are applying for to pushing the molecules of the liquid or gas closest to it, which in turn push the molecules next to it, so on and so on.
Thanks for the helpful video. However, I still have a doubt to which I'm not able to find a satisfactory answer, i.e. What actually causes Upthrust? As in why should liquids exert a force in the Upward direction? I know that liquids exert pressure in all directions, but what causes this at the molecular level? Thanks.
The explanation groups together categories of fluids with completely different physics, gases & liquids, the former being compressible, the latter not - not that this is your mistake as you, like everyone else, learned the physics of static liquids this way. I suggest watching my video on hydrostatic which clearly explains the differences in behavior between the two categories of liquids.
+CrashCourse im beginning to wonder how you turn profit off of this show. the production value seems to be pretty expensive, and you dont get the highest number of views.
I see where you're coming from but may I ask you, can music have the capacity to change individuals or the ability to bring people together, building a sort of community?
Slightly off on the last example if I understand correctly: The racquetball will be in equilibrium once the weight of the racquetball equals the weight of water it displaces PLUS the weight of air it displaces. Granted, I'm probably being pinickity there, as the mass of air is probably negligible for most people's purposes ;)
The buoyant force of air has been disregarded (quite rightly) in most of the problems we've seen in previous episodes too, so it does seem quite "pinickity" to suddenly insist that it be factored in when water is involved. However, when measuring the weight of things to 0.1% or finer, it becomes very interesting because if I buy 100g of gold, am I getting 100g of gold or 100.007 grams of gold that experiences a 0.007g buoyant force as it's placed on the scales? This kind of question also becomes very entertaining in the RUclips comments of videos about aerogels that "have 1/6 the weight of air", yet don't rise like helium balloons...
+TheHue's SciTech I expect the error introduced by ignoring air will be the ratio of the item's density compared to the air's density. If you're measuring something twice as dense as air, you will measure it's weight as being half as much as it really is, as the other half of the weight is counteracted by the air's buoyancy. Gold is dense, so it would definitely be a negligible factor unless you need to be really accurate, but for low density items I suppose it could easily become a significant factor.
Like said, air is also a fluid and fluids can produce pressure andso can air, like already known. However, what is if the whole universe is filled with air? Is life than impossible or is there an opportunity to avoid death?
Great video! Any teasers for future possible subjects? I'm training to be an engineer and these videos are extremely entertaining (such as compression/tension or materials) :P
This is very interesting video for all the educated children and it is very useful and important to all the members who are watching this video and by this who not under stood in school or in the college this is the best and simple way to understand to all the students and for teachers also
Constructive criticism: Would have been nice to explicitly point out that pressure only depends on the column of water above the object, but not on the "overall" amount of water "around" the object, i.e. pressure at the bottom of a 10 cm water glass is identical to the pressure at 10 cm depth in the ocean. But what do I know...?
so if the Boyencey force is: density of water times water displaced times gravity. then how come when an object sinks, the Boyencey Force is not increased ???? the displaced water would be increased and that should directly affect the Buoyancy force according to the formula. :/
Correction time: Archimedes lived in Syracuse, Sicily, which was a Greek speaking place at the time, but is actually, if you hadn''t noticed, considered part of Italy, not Greece.
It was a Greek colony, owned by Greeks, defended by Greeks, inhabited mostly by Greeks, and all of that was long before there was an Italy. But you are correct, he did not live in the region we call Greece today.
deezynar From what I can gather it was not considered part of "Greece" (Ἑλλάς) even at that time, but neither was it "Italy" (Ἰταλία), which refereed to the peninsula. Even through Roman times it was considered separate geographically from Italia. Sicily and the Greek speaking parts of southern Italia were however sometimes called "Magna Graecia" by the Romans. Still this didn't mean they considered it geographically "Graecia" And like I said, Sicily is now considered part of "Italy" politically and geographically, though I realize that has only been since Italy the nation state has been around. Sicily has shifted between a lot of empires and powers over the years and has a unique identity often separate from Italy. This is well known. But considering Sicily is much closer to Italy that Greece, it is rather misleading to say Archimedes lived in Greece, even though he is obviously "Greek." It would be like saying Ptolemy lived in Greece instead of Alexandria, Egypt. So that's the details of it. Honestly, I don't even know what exactly you were trying to correct me on. I said it was "a Greek speaking place at the time" ie the people there were "Greek."
You said he lived in Italy. Italy did not exist at that time. You also minimized the Greek involvement in Syracuse by merely saying it was a Greek speaking place. You went out of your way to post a comment "correcting" the video, and you made misstatements yourself. You did provide accurate geographic information about where he lived, but you missed the mark on the cultural, military, economic, and political affiliations it had with Greece. Syracuse was a Greek trading center set up by Greek traders, inhabited primarily by Greeks, built primarily by Greeks, and defended by the Greek navy. It was not in Greece, but it was Greek.
My God, dude, I know my history. And "Italy" did exist at that point, in one sense. The Greeks had a word "Ἰταλία" for the Italian Peninsula. Next, when did I say he lived in Italy? I said he lived in Syracuse, which is now considered part of Italy. I was just politely correcting the video. It was short and to the point, and I think had nothing wrong with. I "minimize!?" Like, it was just a short comment, I'm not going to write a whole thesis on the history of Greeks in southern Italy. I said it was a " Greek speaking place." I think that is well enough to explain that it was a place that was linguistically and Culturally Greek, at least for a short comment. I don' t know where you get off saying I was wrong myself. I never said Archimedes was Italian. He was obviously Greek. So was Ptolemy, but he lived in Egypt, not Greece. That is the God damn correction.
Are you back? You are desperate to defend your sloppy comment. Just admit that you didn't pay close attention to what you were writing, and let it go. All of these attempts to make it look like you were right is obvious nonsense to anyone reading this.
The manometer works only in when one of the pressure is atmospheric pressure right or else won't the pressure exerted by the bike tire( for example) increase the pressure of the other end and thus there is an interference?
In an engine a cylinder with a capacity of 500cc meaning you can fill the cylinder with 500cc's (or millilitres) of air and fuel, could you simply explain what it means to displace this amount of air and fuel please?
if gas is a solid then yes plasma is a fluid, basically it is the next step, if you have a block of matter it is solid because it is less energized but if you heat it up it becomes liquid, you heat it more it's gas, and then heat and pressurize that to sun like proportions the atoms aren't just loose like a gas but the parts making them up start to tear apart and when two electrons from this separation collide it creates even more energy. so in conclusion plasma is the all powerful ocean of the sun.
Yes, but it's a crazy fluid. Most fluid behavior is governed by fairly weak electromagnetic interactions between molecules. In plasma, there are no molecules and you have free electrons flying all over the place, so there's basically a whole new set of rules. Plasma physics is a cutting-edge field right now, there's a lot we don't understand about it (we actually can't even model normal fluid dynamics that well, this is what Dr. Somara studies in fact).
Discussion was vry interactive and helpful. Specially, presentation is very good. Thank You dear Mam for making such videos. If it can be still slow, it could have been better. But still it is very helpful to understand the concepts. Thank You again.
We made quiz questions to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: apple.co/3d4eyZo
Download it here for Android Devices: bit.ly/3TW06aP
when you explain it: interesting! makes sense!
when my teacher explains it: gibberish
Is it just me or she sounds more excited in this episode?
Makes sense given she said it was her area of expertise
Engineers love fluids!!
Cubestormer Iv I
I mean, this is some really cool stuff.
The description box says she is a Fluid Dynamicist
These physics videos make me appreciate it so much more! Thank you, crash course, for helping tons of students not only learn but actually like the subjects taught to us.
Wow, I just watched a whole chapter in Fluid book in 10 minutes with a fully understanding !!
Thanks a lot Crash-course, That's a GREAT WORK !!!
This is interesting as hell, shame I’m trying to understand this at 10 pm for a test I have tomorrow ☹️
thats a .... cool username
Cheers to the ThoughtCafe! Must be very hard to animate such complex topics, especially if you only have a script to work with.
Thank you so much.. I finally understand 😭❤️ you’re helping me pass first semester physics
True that!
I cannot believe how WELL this series is able to connect everything. From episode to episode, I've been able to put all these abstract concepts in my head together. This one was the definition of pressure. Thank you. I have a final tomorrow and barring my awful math skills and the teacher's insistence on that we must be tricked at all times, I feel -conceptually- ready.
my exam is in half hour and this is first time I am hearing something like this. 😢😢😢
I feel you :/
How did it go?
Funeral was last week it's too soon to talk about it my friend
how you did?
Lol.
You should do Crash Course computers (computer science) and Crash Course electronics as theese are some of the most important industries out there. I think that a CC computers and a cc electronics would inspire young people to pursue a career in the two fields, and show them that it's easier than you'd imagine.
Yeah yeah yeah yeah yeah yeah yeah!!!! I need it badly!!
its already there
check b4 u comment
@@ArnyBoy you realise that you replied a year later right?
@@adeleke5140 so did you
I finished my first and only Physics course this past spring. Still super salty that I didn't have this available to me then.
salty, well you have CC Chemistry :P
Sucks dont it
Chow Tom LOLOLOL I took my first high level Chemistry course 4 years ago, and have had multiple higher level courses since then, like Drug Pathophysiology, where we talk about how medicines move through the body, what properties they have that make them bind to receptors in the body and stuff. If anything, that makes me more salty.
By the way, no disrespect to you with all the lol's, I'm just wiping the salt off my face because I was just one year too early to have this stuff when I needed it the most.
Jeremy this got me to a 5 on physics 1
I just want to say that these graphics are just so gorgeous!
when i was around 13 ( i'm a 16 y.o romanian boy ) i've learned in school the boyant force..called here archimedes force, and when i asked the teacher if always the same percentage of an iceberg remains under water (it's about 90 percent and she said yes ) i had some sort of a smaller eureka moment :)). that day i made a formula of what percentage of a body's volume remains under water, and it was the body's density divided by the fluids density and multiplied by 100 ( if the percentage is bigger then 100 it obviously sinks ). when i showed it to the teacher she took a brief look, and said it's completely wrong, she didn't like me that much. it's so bad to have dumb teachers..but gladly we have crashcourse now! :))
So the equation is something like [density of floating thing]/[density of fluid]=[fraction of floating thing that is below water]
relatable bro
My textbook's 30 pages summed up in 10 minutes. Keep these videos coming. They help me revise well. :")
why did I sign up for physics
Because if you can use it to springboard into engineering which pays big bucks
+Adam Pardoe yurp
and you get paid big bucks to do impressive things as well, which is better than sitting at an office filing paperwork.
So this isn't about drinking water before bed?
LOL
You will sink
You're an amazing teacher Thanks
i spent 2 hours trying to solve a physics problem and failed. 2 mins into this video and I solved it. Thanks for making me feel bad about paying for my tuition. :)
Hey Crash Course you're doing an incredible job! Keep going!!! What about doing a CRASH COURSE MUSIC?? For example, teaching us how to read music or the different music genres and their characteristics, such as Rhythm or their harmonies or even their history.I really think it would be a very great idea :)
THANK YOU SO MUCH FOR EXPLAINING AN ENTIRE CHAPTER IN 10 MINS!!!
I love the pile of Feynman Lectures on Physics on your desk.
FLUID DYNAMICS
OOOHHH BOOY THIS IS GONNA BE A RIDE.
1:13 *Americans* : that’s insulting and unacceptable.
I found that the most fascinating application of Archimedes' principle is the Falkirk Wheel in Scotland. Plus, there's a whole lot of interesting physics behind it, anyway.
Thanks crashcourse tommorrow is my test and this video has made it easier for me to understand fluids.
Since you have done a crash course on astronomy and on Classical Physics could you do one on Quantum Mechanics??I know that you have a couple of videos on nuclear physics for crash course chemistry but a whole series dedicated to quantum mechanics,nuclear physics and fundamental particles would be extremely interesting.
This is something I've been pitching for a while, but it would be a significant step for us. We're working on it at some point though :)
-Nick J.
I am not sure if lessons should be delivered with such speed. Students who just started learning about pressure will probably be lost at the latter part.
Best review video on static fluids I've seen! Thank you!!
thanks this vido was understandable to me
man give the comment section a glass of water! you are watching physics not biology ;-)
Archimedes lived in Syracuse, Sicily (then a Greek colony)
Exactly!
YES and that was in Sicilly, modern day Italy, not greece but I guess this is about phisics and not history.
+Darius Niederer He was apparently killed by a roman soldier after they had attacked his home city. The roman commander knew how smart he was and wanted him alive but when the soldier told him to come with him he told him not to disturb the calcu
ations he was drawing in the sand. He was promtly struck down. Apparently he had previously also designed war machines to help defend Syracause although some of them like ship-burning mirrors seem to belong to fiction,
That's what I tell everyone at work when I arrive.
The Greeks and the Phoenicians both had trading outposts, colonies, all around the Mediterranean Sea, usually pretty close to each other.
Nice work, this series is really starting to get into stride
I remembered diving to the bottom of a 16 foot deep pool once and it hurt like crazy. I just worked it out and apparently it was only a pressure of about 1.5 atmospheres or ~150 kilopascals. Not nearly as much as I thought it would be based on how it felt. Shows just how sensitive people are to pressure changes. Though I'm sure it would have helped if I popped my eardrums by blowing out with my nose plugged.
I have to say, I could not be more thankful for Crash Course Physics. With the beautiful and helpful graphics and impeccable writing, this series and everyone who worked on it is what is keeping me at an A+ in Physics for Bio Majors
Explanation is so interesting.. Keep it up..animation is also interesting make more videos as possible u r awesome
Love the added animations!
She is one of the best presentets. Have her on more often please
Presenters*
+Neeni1994 Screw how she looks like. I could listen to this smartness whole day.
"Thanks to Archimedes, we know why objects float and sink." 8:37
Isn't it more accurate to say that since Archimedes, we know HOW they float and sink, but not WHY? It seems to me that the terminology used to explain the differences in forces is Newtonian physics rather than classical physics.
Don't want to nitpick though, I love this series!
I don't study physics or use it in my work. But I could listen to Shini talk all day.
Hm seems youd be the type to go for Lara croft too. both british
Eileen Blurrr There's more to having a great voice than just the accent.
Yeah but Lara crofts voice actor is pretty good sounding too. at least for that new game
symmetra?
You're the only one who sees that.
lol good one
made my day
Nah Pharah
Symmetra a better fit since this the course is Physics.
Thank you! We've learned at school about Archimede's principle and I managed to do pretty well, but it was something weird about it that just made me think it wasn't intuitive at all ! After I watched your video something just clicked in my mind and now it seems very simple and logical to me ! I know this sounds pretty generic and you get these kinds of comments every day, but I just wanted to say it was an eye opener for me! ☺
I have a question about the last case she talked about the ball being halfway in the water, yes forces cancel out but why is that? is it because of the density of the material the ball is made of that is equal to the water's or is it something else?
Oh nooo I need more videos! My final is in a week and theres still more material I wanna watch a crash course video about!D;
AFAIR from my course in Control and Automation Engineering, m/v is not density but specific mass; density is the specific mass of a fluid in relation to the specific mass of water, whic is 1. :T
Shini is so beyond beautiful, I now know what "lost in your eyes" means. I have to watch it twice just to catch it all, First time for everything.
Femininity incarnate
4:00
y0u left 0ut a key feature in that the f0rce and distance m0ved are inversely related.
s0 in y0ur example, it "d0ubled the f0rce which means it w0uld m0ve "half the distance.
s0 if y0u m0ved 2in 0n the input, it w0uld 0nly m0ve 1in 0n the 0utput....
s0 its d0uble the f0rce but in half the distance.
the same equati0ns apply t0 pulleys (I believe).
Watching this as I study for the MCAT. Great over views of the things I read. Very thorough. Sometimes a bit fast but that's what rewind is for ^_^. Thank-you for posting these. Physics and fluids are by far my worst subject
So, force of gravity on ball depends on mass, and force of buoyancy depends on volume.
I have a question. Imagine a cylinder which height is greater than its diameter (so it's a thin cylinder). First it is placed horizontally on the water, then it is placed vertically in the water. Since buoyancy is the resultant force from a difference in pressure, can I conclude that the cylinder in the second situation experiences a larger buoyancy force than that of the first situation because of its orientation?
Content table
Fluid at rest
Pascal's principle
Manometer's and barometer
Archimede's principle
Buoyant force (Pressure on water at bottom greater than water at the top)
But putting an object in a liquid doesn't really increase the liquid's volume at all, it just pushes an equal volume of liquid to its own volume aside, displacing it. That's why by putting the crown in a bowl of water that's filled to the brim and then measuring the volume of the water that is displaced and runs over the edge, you can find the crowns volume.
So to reiterate, no increase, just displacement.
I keep waiting for them to stop making mistakes like this. It seems like they don't have any actual TEACHERS consulting on this. This "seems" like such a silly distinction to a scientist with a masters or doctorate, but it's a fundamental misconception and they explained it in a way that will perpetuate that misconception!
Sorry about that. I'll have a closer look at it and talk to our consultants (who are teachers of varying grade levels) and see if we should annotate that or something. This is one of the most difficult parts of video, in that, if something slips through, it's much harder to fix. Whereas in a lecture, you can just step back and say, "Oh whoops, what I mean is this..."
- Nick J.
+CrashCourse I completely understand what you're saying. Thanks.
Just 2 more months and I never have to think of this confusing stuff again. I understand the basic stuff that we learn in elementary school but when it gets more complicated and I try to apply it, it makes no sense.
If the Bernulli equation is solved, the final pressure (P) is equal to the initial pressure (Po) plus ¡ 2 times ! the density (times the acceleration constant by gravity) (times the difference in fluid heights) !! P = Po + 2gΔh !!! Thanks for the video is very useful
physics issa my life
this explained the buoyant force so well
I kind of love you. ❤️
Thanks for making science easy for me.
Awesome explanation!
Thank you for this course. At last I understood how to calculate the mass of an immersed object...
I love physics
this is some serious editing pls tell me what you used to edit this video
Very educating. A big thumbs up from Norway!
why isn't episode 13 in the playlist? it says its deleted but you can still watch from some where else. it s about static.
Fixed it. Thanks for the heads up!
Nick J.
Truly a crash course, thx :3
what gets conserved when you use a hydraulic lift? Its cool that you can magnify your force, but has to come at a cost? Intuition says work(energy) has to be conserved, but I don't see how.
You're right, it's work, of course neglecting friction. And you can see it by another conserved quantity, the volume displaced. That volume would be Area x Distance. As Area=Force/Pressure, and Pressure is the same according to Pascal's principle, you have that Force x Distance is also conserved, and that is work.
I really do like your derivation of the Buoyant force!!
Does Pascal's Principle actually happen instantaneously? Conceptually it is the molecules of the object you are applying for to pushing the molecules of the liquid or gas closest to it, which in turn push the molecules next to it, so on and so on.
Thanks for the helpful video. However, I still have a doubt to which I'm not able to find a satisfactory answer, i.e. What actually causes Upthrust? As in why should liquids exert a force in the Upward direction? I know that liquids exert pressure in all directions, but what causes this at the molecular level?
Thanks.
After all her vids i realize im in love with her. I mean look at her hair alone. She is a godess
Really usefull! And in perfect timing! Thanks!
I love this "new girl". She just like the main two guys looks incredibly presentable, plus love her accent.
The explanation groups together categories of fluids with completely different physics, gases & liquids, the former being compressible, the latter not - not that this is your mistake as you, like everyone else, learned the physics of static liquids this way. I suggest watching my video on hydrostatic which clearly explains the differences in behavior between the two categories of liquids.
Your videos help so much thank you
Are you planning on making more shows?
Yep. Many many shows. Many!
-Nick J.
Yay :D
+CrashCourse
im beginning to wonder how you turn profit off of this show.
the production value seems to be pretty expensive, and you dont get the highest number of views.
I hope for a Crash Course Geology.
The aim is most likely to break even.
Crash Course: Architecture, anyone? I think it would be splendid.
I see where you're coming from but may I ask you, can music have the capacity to change individuals or the ability to bring people together, building a sort of community?
God! Why is Shini so cute when she's excited! Look at her smiling the whole video!
Slightly off on the last example if I understand correctly: The racquetball will be in equilibrium once the weight of the racquetball equals the weight of water it displaces PLUS the weight of air it displaces. Granted, I'm probably being pinickity there, as the mass of air is probably negligible for most people's purposes ;)
The buoyant force of air has been disregarded (quite rightly) in most of the problems we've seen in previous episodes too, so it does seem quite "pinickity" to suddenly insist that it be factored in when water is involved.
However, when measuring the weight of things to 0.1% or finer, it becomes very interesting because if I buy 100g of gold, am I getting 100g of gold or 100.007 grams of gold that experiences a 0.007g buoyant force as it's placed on the scales?
This kind of question also becomes very entertaining in the RUclips comments of videos about aerogels that "have 1/6 the weight of air", yet don't rise like helium balloons...
+TheHue's SciTech I expect the error introduced by ignoring air will be the ratio of the item's density compared to the air's density. If you're measuring something twice as dense as air, you will measure it's weight as being half as much as it really is, as the other half of the weight is counteracted by the air's buoyancy. Gold is dense, so it would definitely be a negligible factor unless you need to be really accurate, but for low density items I suppose it could easily become a significant factor.
Like said, air is also a fluid and fluids can produce pressure andso can air, like already known. However, what is if the whole universe is filled with air? Is life than impossible or is there an opportunity to avoid death?
u wot m8
Thank you, thank you so much for Crash course physics!
Watching these videos is one way to get a headache.
You have two cylinders containing the same volume of water one is tall and skinny the other short and fat. Which one would need a stronger wall?
under 10 minutes ✔️
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surely won't be a hit
Mick Källbacka by 2 secs
Great video! Any teasers for future possible subjects? I'm training to be an engineer and these videos are extremely entertaining (such as compression/tension or materials) :P
This is very interesting video for all the educated children and it is very useful and important to all the members who are watching this video and by this who not under stood in school or in the college this is the best and simple way to understand to all the students and for teachers also
It's very nice
When is the next episode and how long do you expect the series to last?
Very helpful
She is SUPER excited.
Constructive criticism: Would have been nice to explicitly point out that pressure only depends on the column of water above the object, but not on the "overall" amount of water "around" the object, i.e. pressure at the bottom of a 10 cm water glass is identical to the pressure at 10 cm depth in the ocean. But what do I know...?
Nice one , best for clearing concepts
Need to take her class asap!
More fluid dynamics please :)
so if the Boyencey force is: density of water times water displaced times gravity. then how come when an object sinks, the Boyencey Force is not increased ???? the displaced water would be increased and that should directly affect the Buoyancy force according to the formula. :/
guys ... a solids mechanics video needed please
Thanks you . You are just Awesome, I love to learn physics with you😋
Wonderful explanation!😊
Correction time: Archimedes lived in Syracuse, Sicily, which was a Greek speaking place at the time, but is actually, if you hadn''t noticed, considered part of Italy, not Greece.
It was a Greek colony, owned by Greeks, defended by Greeks, inhabited mostly by Greeks, and all of that was long before there was an Italy. But you are correct, he did not live in the region we call Greece today.
deezynar From what I can gather it was not considered part of "Greece" (Ἑλλάς) even at that time, but neither was it "Italy" (Ἰταλία), which refereed to the peninsula. Even through Roman times it was considered separate geographically from Italia.
Sicily and the Greek speaking parts of southern Italia were however sometimes called "Magna Graecia" by the Romans. Still this didn't mean they considered it geographically "Graecia"
And like I said, Sicily is now considered part of "Italy" politically and geographically, though I realize that has only been since Italy the nation state has been around. Sicily has shifted between a lot of empires and powers over the years and has a unique identity often separate from Italy. This is well known.
But considering Sicily is much closer to Italy that Greece, it is rather misleading to say Archimedes lived in Greece, even though he is obviously "Greek." It would be like saying Ptolemy lived in Greece instead of Alexandria, Egypt.
So that's the details of it. Honestly, I don't even know what exactly you were trying to correct me on. I said it was "a Greek speaking place at the time" ie the people there were "Greek."
You said he lived in Italy. Italy did not exist at that time. You also minimized the Greek involvement in Syracuse by merely saying it was a Greek speaking place. You went out of your way to post a comment "correcting" the video, and you made misstatements yourself. You did provide accurate geographic information about where he lived, but you missed the mark on the cultural, military, economic, and political affiliations it had with Greece. Syracuse was a Greek trading center set up by Greek traders, inhabited primarily by Greeks, built primarily by Greeks, and defended by the Greek navy. It was not in Greece, but it was Greek.
My God, dude, I know my history. And "Italy" did exist at that point, in one sense. The Greeks had a word "Ἰταλία" for the Italian Peninsula. Next, when did I say he lived in Italy? I said he lived in Syracuse, which is now considered part of Italy.
I was just politely correcting the video. It was short and to the point, and I think had nothing wrong with.
I "minimize!?" Like, it was just a short comment, I'm not going to write a whole thesis on the history of Greeks in southern Italy. I said it was a " Greek speaking place." I think that is well enough to explain that it was a place that was linguistically and Culturally Greek, at least for a short comment.
I don' t know where you get off saying I was wrong myself. I never said Archimedes was Italian. He was obviously Greek. So was Ptolemy, but he lived in Egypt, not Greece. That is the God damn correction.
Are you back? You are desperate to defend your sloppy comment. Just admit that you didn't pay close attention to what you were writing, and let it go. All of these attempts to make it look like you were right is obvious nonsense to anyone reading this.
The manometer works only in when one of the pressure is atmospheric pressure right or else won't the pressure exerted by the bike tire( for example) increase the pressure of the other end and thus there is an interference?
In an engine a cylinder with a capacity of 500cc meaning you can fill the cylinder with 500cc's (or millilitres) of air and fuel, could you simply explain what it means to displace this amount of air and fuel please?
Is plasma a fluid?
if gas is a solid then yes plasma is a fluid, basically it is the next step, if you have a block of matter it is solid because it is less energized but if you heat it up it becomes liquid, you heat it more it's gas, and then heat and pressurize that to sun like proportions the atoms aren't just loose like a gas but the parts making them up start to tear apart and when two electrons from this separation collide it creates even more energy. so in conclusion plasma is the all powerful ocean of the sun.
Yes, but it's a crazy fluid. Most fluid behavior is governed by fairly weak electromagnetic interactions between molecules. In plasma, there are no molecules and you have free electrons flying all over the place, so there's basically a whole new set of rules. Plasma physics is a cutting-edge field right now, there's a lot we don't understand about it (we actually can't even model normal fluid dynamics that well, this is what Dr. Somara studies in fact).
its like a georgeous model given a textbook of quantum physics to read infront of the judges
Discussion was vry interactive and helpful. Specially, presentation is very good. Thank You dear Mam for making such videos. If it can be still slow, it could have been better. But still it is very helpful to understand the concepts. Thank You again.