Buoyant force example problems | Fluids | Physics | Khan Academy
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A couple of problems involving Archimedes' principle and buoyant forces. Created by Sal Khan.
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Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
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@bwibwi5 10 жыл бұрын
"It could have been shaped like a horse."
@syedrizvi2687 3 жыл бұрын
I love your small interesting digressions when you teach! Your power in explaining concepts is phenomenal :D May God bless you in your mission of free World Class Education to all!
@Aishaelhouderi 11 жыл бұрын
you are a legend, your videos always make me change the way i think about these problems. Could you please make videos about hydrostatics.I am really struggling with them. thanks again
@mariofrendoz7488 10 жыл бұрын
Thanks Sal. This Video helped me a lot.
@anashassan4861 2 жыл бұрын
13 years later and he's still a legend just wow.
@achintyasingh2025 Жыл бұрын
Your explaining language is so easy to gauge the concept. That anyone can get it’s complicated language to a simple one. Thanku so much
@najjmx2422 5 жыл бұрын
i like how u casually start your videos like a casual convo
@Noor-wc1ji 5 жыл бұрын
i looked at his calculator and immediatly knew it is 2008
@promiseoke6309 3 жыл бұрын
Thank you so much for this ...it is really helpful 😍
@bilhassan4604 7 жыл бұрын
This help me to finally understand this topic and question!!!!!!
@sergiomuniz350 6 жыл бұрын
Fluids made easy. Great stuff.
@johnmandrake8829 6 жыл бұрын
I appreciate you so much..honestly
@asherzephyr 15 жыл бұрын
Yes, the fraction submerged is equal to its specific gravity.
@JoseShajiOfficial 3 жыл бұрын
11 years ago, are you still alive
@tranquilious 2 жыл бұрын
Are you alive?
@tranquilious 2 жыл бұрын
13 years ago
@randomheliumball7505 2 жыл бұрын
@@tranquilious rip
@omoolorunful 12 жыл бұрын
OMG thank you so much. I've been struggling with my tutorial question for ages, Now I get it!
@JoseShajiOfficial 3 жыл бұрын
frrr
@BaRa6992 12 жыл бұрын
Khan ..! God bless u
@chinoisbase 10 жыл бұрын
my textbook didn't express that important detail about Archimedes principle, but still ask a question directly from it. I hate my book
@mementomori5748 7 жыл бұрын
mine is the same it sucks
@auxcord8919 7 жыл бұрын
I appreciate the effort. but I lol-ed so hard when you said to turn this nightmare into a game with friends... haha
@rockinrec22 10 жыл бұрын
great video im in 8th grade and I feel like the current curriculum is for 2nd graders so I started doing this in my spare time.
@pxatm 10 жыл бұрын
Hey Gavin can we forward this to like, teaching circles?
@asherzephyr 15 жыл бұрын
No, he got it right. Vs/Vb is telling you what percentage of the object is submerged while Ps/Pb is telling you the specific gravity. If you switched it, the whole proportion would be messed up and basically it would be saying the volume submerged is greater than the block itself. Then the object wouldn't be floating....
@RedVenomProductions 7 жыл бұрын
what i find very puzzling and confusing is in the buoyant force equation you have to put volume of water displaced ,but if the volume is the same for two objects and one of them has less mass and there both denser than water how would the bouyant force be the same for both if they have different densities. Please respond thankyou
@i03i 3 жыл бұрын
thank you, now I understand buoyant force for my quarter exam
@JoseShajiOfficial 3 жыл бұрын
fr
@KaterMUC 4 жыл бұрын
How do you get from cubic meter to square feet? Missing a Dimension here?
@anilceafp311 7 жыл бұрын
Very good!!
@Billabong024 13 жыл бұрын
excellent example
@elistidham8494 2 жыл бұрын
best youtube ever hands down
@MrDod9 10 жыл бұрын
Interesting video...
@saada8837 8 жыл бұрын
In the last video he said that Fnet = Pwater . gravity . d3 (volume) so why is he not using the net force of 2N and is instead using 8N force upwards? Also if the force down is 10N and force up is 8N then should this block just sink? what is the counteracting to prevent his block from sinking?
@jhonellemoore6684 6 жыл бұрын
The block is sinking, that's why the net force is not equal to the weight of the object
@Ryan-vw8gn 9 жыл бұрын
The net force downwards is 2N, but he's working out the volume of water displaced, so you use the buoyant force of 8N.
@trentf8607 3 жыл бұрын
So this only works for blocks and horses. Good to know!
@calvinhobbesliker2 15 жыл бұрын
Does this mean that the fraction of the floating object submerges is equal to its specific gravity?
@volintine 15 жыл бұрын
thnx sal
@siasorat 13 жыл бұрын
one person failed in life lol who the eff dislikes this video it made so much sense hope i could ace my final now lol
@Hellsslave666 13 жыл бұрын
@spikeyredcactus devide both sides by VB and by PW and flipped sides. I tryed to write all stepps down, but it's really hard with a keybord xD
@shirasvlogs 7 жыл бұрын
super eth nangalk prayojanam ullathan thanku
@lightningmcdweeb 6 жыл бұрын
da malayalathil paranjal evanmarkonum manasalavathilya
@harikumart.t1907 4 жыл бұрын
Malayalis here malayalis there malayalis everywhere pwoli
@treeislife93 6 жыл бұрын
Sir I have some few question about density and buoyancy force No. 1 =Is hot water more dense or cold? i think cold is more dense. No. 2 = if cold water more dense what it mean is it more buoyancy?i think cold water more buoyancy. No.3 =if cold water more dense so does it help for swimming easily? i think cold water help swimming. No.4 =is water more dense mean more buoyancy easy to float or less dense mean less buoyancy difficult to float?
@minetech4898 3 жыл бұрын
When being forced to watch this for school, I wish KZfaq had a 3x speed feature.
@teudoongie7366 3 жыл бұрын
It have
@jasondominicpereira1545 3 жыл бұрын
Percentage of the Volume of that substance submerged would be specific gravity of that substance multiplied by 100
@christophernasser9441 6 жыл бұрын
good math!
@slmUSA 13 жыл бұрын
Thank you!
@JoseShajiOfficial 3 жыл бұрын
whoa
@UT.Rapstar 3 ай бұрын
I love this place
@marcellohro 15 жыл бұрын
the second example was beautiful!
@JoseShajiOfficial 3 жыл бұрын
you thought the second example was beautiful 12 years ago
@marcellohro 3 жыл бұрын
@@JoseShajiOfficial Interesting... When I was watching this I was in high school. I concluded a graduation and master at mechanical engineering. Turns out I started not enjoying engineering and changed career. I think I changed my mind, the example is ok at best.
@aquienpuedaimportar3028 6 жыл бұрын
Why do we use g for the force acting on the bottom of the object? If the force acting on the bottom acts upwards and gravity acts downwards, why is g included?
@harpergrace2510 2 жыл бұрын
Basic Newton principle F=ma
@Citicoper 5 жыл бұрын
why it turns 240p
@angrypepecancer5205 7 жыл бұрын
its really confusing when you convert it to ft^2 and 1 cubic meter = 10.7639 square feet where did that 27 came from. Can someone explain.
@embeetwelve 7 жыл бұрын
He was doing very rough calculating just so you have an Idea of the size of the cube. There are roughly 3 feet in a meter, so there are 3^3 feet in a cubic meter which equals 27 cubic feet. He also misspoke.
@carlanw 6 жыл бұрын
The actual math is 0.0083 m^3 = 50.0395 inches^3. He miss notated it as ^2 squared but he is close for approximating. I hope that helps someone.
@FrinZHoN 12 жыл бұрын
i wonder if its correct or not but the whole object is displaced therefore i would use the 10N.. ^^
@mbusomabuza7273 9 жыл бұрын
do i have to memorize the densities
@agent475816 8 жыл бұрын
+mbuso mabuza No, they are usually given on the test. You probably have to know the density of water is equal to 1000 kg/m3
@prithviraj7322 10 жыл бұрын
in previous video you said that the net force equals the weight displaced...here the net force is 2N so shouldnt it be equal to the weight of liquid displaced?
@_DigitalRemake 7 жыл бұрын
prithvi raj buoyancy force is 8N
@jhonellemoore6684 6 жыл бұрын
The buoyant force is only equal to the weight displaced when it floats, this is a sinking object, so the upthrust equals loss in weight
@Userwastaken 13 жыл бұрын
I wonder what the person was thinking when they clicked the thumbs down button...? I'm only in 8th grade, but my physics teacher wants me to take 4 pages worth of notes on this fluid series. Haha, it's a bit difficult to understand using only letters.
@TyphoonTheGuitarist 8 ай бұрын
Are you in 20th grade right now?
@repathon 15 жыл бұрын
damn i wish i could use these videos on the ap test
@JoseShajiOfficial 3 жыл бұрын
ap tests 11 years ago whoa
@redgrim7708 2 жыл бұрын
how can you convert cubic feet to square feet?
@johnsantos975 2 жыл бұрын
I need to go back to school to keep up
@도목이 11 ай бұрын
와.정.말.재.밌.다
@joseguilfu4739 6 жыл бұрын
Why did you divide 1000 times 9.8? I thought you had to multiply it
@ashokdas5645 6 жыл бұрын
Nice
@rohitupadhyaya7 6 жыл бұрын
ashok da
@SAURABHKUMAR-dz5dt 3 жыл бұрын
What do you know sir??
@ccsargent 3 жыл бұрын
First problem error: he kept mixing sq in with in^3.
@thenathan829 11 жыл бұрын
i just love you so much
@bewaver 5 жыл бұрын
9.8 m per second squared is not gravity but acceleration...
@fyuira9585 5 жыл бұрын
nah not acceleration but acceleration due to gravity. And when he says gravity that what he means mate. hahah
@superduckduck 7 жыл бұрын
when did the writing become so fuzzy
@925LY 7 жыл бұрын
this video was made in 2008
@nolsmtm 14 жыл бұрын
dont you mean cubed feet? (not square feet)
@zhto514 4 жыл бұрын
Are you still alive ?
@sodr2 14 жыл бұрын
couldve been SHAPED like a horse....i dont think a horse has a specific density
@catindoyleonardorivera9627 4 жыл бұрын
w
@joebender3662 6 жыл бұрын
34 square inches I think not
@carlanw 6 жыл бұрын
50.0395 cubic inches but he was approximating from using the rough 27 cubic feet per cubic meter.
@Premkumar-hj2dr 6 жыл бұрын
🙂👍🏻
@rexgregorlaylo7724 8 жыл бұрын
him: weight of water ... i dont know... 10N me: dafuq stating naive but giving its value anyway!
@vincenttran8415 6 жыл бұрын
You know he's just coming up with some random number to use as an example.
@dst7ssa 14 жыл бұрын
It could be a Horse ? hahaha good one
@zhto514 4 жыл бұрын
R u still alive ?
@TeofilWhite 3 жыл бұрын
ripo
@dakshkholia8564 2 жыл бұрын
a
@kacavvh 6 жыл бұрын
read me bedtime stories plz
@spacekatana8539 2 жыл бұрын
larry
@Roadside33 20 күн бұрын
Import turtle
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