What is Buoyancy? | Physics | Don't Memorise

[@InfinityLearn_NEET]

Archimedes had discovered the laws of buoyancy, known as The Archimedes Principle. Items that float must weigh less than the fluid or gas they’re floating in; heavier items sink. To learn more about Gravitation, enroll in our full course now: infinitylearn.com/cbse-fullcourse?KZbinDME&UBsFU4&Comment To watch more Physics videos, click here: bit.ly/PhysicsVideos_DMYT

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[@Mahesh_Shenoy]

Great video, but I guess there is one small error in the video. The buoyant force does not increase with depth. As you rightly mentioned the buoyant force is the net force due to the difference between the upward and downward pressure. As you go down, this pressure difference remains exactly the same. (both upward and downward pressure increase by the same amount). So buoyant force is a constant and independent of depth. The only reason why the bottle has a higher speed near the top when released from the bottom is that it's accelerated for a longer time. Just like how a stone dropped from more height, hits the ground with more speed. (But the gravitational force is pretty much the same at any height close to earth)

[@mostafaseif4409]

Been looking for this comment.

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[@definitionsinurdu2646]

You are right,probably

[@Vedic__Vision]

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[@song-dance-painting]

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[@anuradhamanocha1828]

I learn more from net and less from book

[@vikrammodi1632]

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[@ibsamhammad5298]

As book is now not given in full detail and also does not explain completely

[@kamladevivyas766]

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[@pragatbharat]

I too, Whatever i have studied with the help of internet in one year that i didnt got to study in last twelve years

[@bangtan...stannerrrr]

0:00 what a sound❤

[@jasongross5504]

Buoyant force does not change with depth once an object is fully submerged. I think there is an error @ 1:52 when you say that you will feel more force against your hand. the difference in pressure between the top and the bottom is the same anywhere in the water once it is fully submerged.

[@billsmith7673]

I agree.

[@kulwinderkaur-ji3tc]

I would like to correct you

[@kulwinderkaur-ji3tc]

The thing is the depoer you go in water the pressure also increase.. that's why it will change...

[@kashika811]

The name of your channel is very true. Whenever I used to watch your videos I don't have to mug up things . It automatically fits on my mind . Thank u so much 💓

[@InfinityLearn_NEET]

Thank you so much for your kind words, Mannat! We are so glad to know our videos could actually help you understand the concept. Keep watching!! 🙂🙂

[@mathtrix14]

What app do you use for the cute animation?

[@BrageHe]

I think you made a small error at around 1:50. You will not feel a bigger force the deeper you hold the bottle, as buoyancy does not depend on depth. Upward force increases, but downward force increase proportionally. In this case you would actually feel less force, since the air in the bottle would compress, and less volume means less buoyancy!

[@feyyaznegus3599]

It is not a small error, it is a terrible error, which you would expect from someone, who does not have good understanding of physics.

[@claramelb7476]

I feel like it’s too much pressure to learn Physics in class (just like many other subjects) I actually hated most of it even though I successfully passed my classes, but now that I’m learning Physics by myself during the summer, it just makes so much sense and feels peaceful. I now understand why people actually study pure Physics 😊

[@learrnner]

Same 😂

[@Pranamey]

Who all are watching this video one day before exam 😂

[@anjalikamat4294]

UT bri 😂😂

[@anjalikamat4294]

😅

[@taso1995]

0:50 the buoyancy force is there because of pressure difference. Pressure at any given depth is p=ρ*g*h were h is depth, 1:50 so the force is the same no matter the depth. Am i right?

[@tsunderesoul]

@@agmantrivedi6608 Yes, I'm thinking the same! Buoyant force ONLY depends on the volume of the fluid it displaced. But what she said is true, the bottle rushes up faster as it's submerged , I'm not sure if this is because there's more work being put into the submerged object (Work = Force x Distance)? Thus by having a constant amount of force pushing the bottle up for longer distance makes it shoot up higher as it reaches the surface? Please correct me if I'm wrong.

[@pawannaithani99]

yes exactly .

[@shivamsingh9157]

Once the object is completely immersed in liquid, buoyant force will not change with depth even though the pressure is increasing as we go deeper.

[@ozguroner9944]

Yes, because the difference in pressure at the top and bottom (net) is still the same although at different values. That was an error in the video. You are correct.

[@run3426]

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[@akiiwahgreen5676]

Thank you,and same to you to!

[@mostafaseif4409]

There's a mistake at 02:00 that conflicts with Archimedes' principle; the buoyancy force does NOT increase the more you go deeper in the fluid. The bottle will go upward faster due to the acceleration caused by the force, as F = m.a. but The buoyancy force remains constant and is equal to the volume of the displaced fluid volume.

[@willoughbykrenzteinburg]

It depends on the fluid. For an incompressible fluid like water, you are correct. In a compressible fluid like the air in our atmosphere, the buoyant force does indeed get larger the "deeper" you go because the density of the air being displaced is higher - i.e. weighs more - ergo the buoyant force is stronger.

[@mostafaseif4409]

@@willoughbykrenzteinburg well they didn't speak about air in the video, and I think that this change is pretty much negligible.

[@willoughbykrenzteinburg]

@@mostafaseif4409 They said "fluid", and air is a fluid. So, they did indeed mention air. I would also disagree with your categorization that the difference is "negligible". It's not. The buoyancy in a compressible fluid is greater with depth. This is a factual statement. The only thing omitted was the word "compressible".

[@mostafaseif4409]

@@willoughbykrenzteinburg No seriously, this video is for people in elementary school or smth, they did not mention anything about air and they had water with a bottle as an example, it is a common misconception and they fill for it for a direct fact. And when I say negligible that's because we're not talking about air planes here or about any aerodynamic massive rocket we're building, this is basic water buoyancy or air buoyancy like a floating baseball or basketball, there won't be much affect due to any "real" depth difference like kilometers or so.

[@willoughbykrenzteinburg]

@@mostafaseif4409 I've moved on

[@kikimerinda]

thank you for explaining it for meee!!!

[@sunilverma1975]

Buoyant force I. e exerted by water depends on surface area ...... therefore metal pin have less area will sank and balsa wood having more area will float

[@garyzzgg4762]

Great accsent this is my first time watching on this channel.

[@Broccoli6793]

2:16 the spelling of pressure is wrong lol

[@prathitprasad]

This is text to speech man😂😂😂😂😂

[@AUselessGod]

@@prathitprasad Don't think so, sounds like a real person to me. I have met a lot of Indian people who have an accent like this. And of course because it's Science related and on KZbin, there's some Indian person teaching that. It happens every time.

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[@utkarshninawe97]

Let the mass of both metal pin and balsa wood be m. But the volume of wood block is more than that of a pin 📍. The pin has same amount of matter in lesser volume, therefore it is denser tha block. So, it will sink and the wooden block will float(theoretically). Assuming that metal pin is denser than water and the wooden block is less dense than water

[@Rahulsharma-mw1yg]

Also we can say that In outside water , volume less so density increases so goes up In inside water, volume More so density decreases so goes down

[@haseenashaik5571]

First time I didn't understand from this channel Plz explain more breifly

[@PositivityyPill]

On my understanding i think Buoyancy/Upthrust is an up movement in fluids

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It's make the students learn more✍️✍️✍️

[@vaishalikoli3089]

Thank u soo much u explain it soo well. I was literally not able to learn a single answer n u helped me with that thank you again...

[@InfinityLearn_NEET]

Thank you Vaishali for your appreciation. We hope that you understood the concept. We are glad that we could help you learn. You really motivate us. We love our Pi Army and would like to stay connected.😊😊🤗🤗

[@luckygamingff213]

I don't like physics at all but after watching ur videos I am getting interested on physics thank u so much don't memorise

[@pratyushmishra7089]

1:13 but the Newton's third law statement is wrong here tho ,can you explain in form of reply please

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Helped more than my 1 hour physics class

[@Aurora_xthetic]

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[@kothakondasravanthi4843]

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[@sujaankhanna]

If we take a ball of same weight and volume. The buoyancy and weight will be balanced so if we put the ball on height 'h' from top then will it go up (float), or it will go down (sink) OR it will be on 'h' height only (as it is not practically possible that an object stays the place where it was)

[@kalandartippunagar4685]

It's very interesting 😍😍

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Thank you so much for your appreciation. Glad you think so Kalandar. We are glad that you understood the concept. This really motivates us.😊😊

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One of the best video I ever seen

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At 0:19 the rock hits the dudes toes, I feel bad for him. 😶

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[@madhuramondkar8661]

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[@motivationalkanha4036]

the pin will sink down as the area of the pin is less and the buoyant force will be less but the balsa wood will float as the area is more and buoyant force will be more

[@ayaanbofficial]

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Don't Memorise taught better than my teacher. It is the best

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Amazing and interesting explanation 👍

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[@casyleer144]

So air as a gas works the same way rite, The lower the atmosphere the denser and more force it takes to go up in altitude....

[@prolearning_academy]

A bit more softer but content is very good

[@nirukumari7721]

There's a mistake in this video. Once a body is completely immersed in a fluid, the buoyant force does not increases with depth. Because as you correctly mentioned in the video that buoyant force is the difference of the downward and upward forces acting on the body - so there difference will be constant bcoz same pressure increases on both up and down face. -- This is given in my book. Please correctly this mistake ASAP so that people don't get confused. Other than this, very helpful video! Keep up the good work. We need it!

[@Redhaired.10]

she didnt talk about the object touching the surface so how is she wrong.

[@ritikasingh934]

I understand the concept fully and very clearly . Thank you so much.

[@bisht9437]

Please solve this question A machine can do 53712002 J work in 1 hour. What is the power of the machine in horse power?​

[@shivradha227]

Thank you I have not memorize I just understood it

[@harshu6044]

Mam u said that because of buoyant force the object appears to be lighter when immersed in water .so,why does we fell the plastic bottle heavier in water ?

[@satyamtekriwal7376]

Cause it's trying to push upwards to surface

[@harshu6044]

@@satyamtekriwal7376 ohk!! Thankyou so much 😊

[@onlygamesfornothing5029]

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You are best mam

[@InfinityLearn_NEET]

Thanks a lot, Shekh Amir! Keep watching 🙂🙂

[@girishtalasdar2022]

Really helped me a lot thanks

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You're most welcome. We are really happy to hear that it was helpful to you. We are glad that you understood the concept. For more videos, please visit our website - dontmemorise.com/

[@vaibhavsingh8361]

Thanks for easy explanation

[@seemaagrawal5288]

Mam please make videos on.. E=MC^2

[@khannakhushi811]

You are simply amazing 😉

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[@yaraaziz4361]

I have a question Why is the force exerted upward is more than the force exerted downwards? I mean shouldn’t it be the force exerted downward more since the pressure, that is increasing with depth, is exerted downwards on the object ?

[@varundevsingh5700]

Wood will float while pin will sink. The reason is density.

[@amitkumar-ru8wx]

If we go deep down then pressure increases so there should be more downward pressure why you have said that there is more upward pressure in the box example

[@sumitsaha3335]

Mam I what to ask that the upward force of water is the reaction force for the high pressure acting on it due to it's depth?

[@rockythecocktiel]

Lovely video thank u

[@ggvibes4544]

After watching the video twice and relating it to real life, I understand what Buoyancy is. Thank you Don't memories for your awesome videos!

[@ritikayadav9651.]

U r too awesome teacher

[@InfinityLearn_NEET]

We're humbled to hear that! Thank you :)

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Thank you all the teachers 😊❤️ I don't like physics at all but after watching all your videos I learnt that nothing is impossible to do Thank you ❤️❣️

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You are most welcome, Rupali! We are glad we are able to help such enthusiastic learners like you 😊

[@Broccoli6793]

2:16 the spelling of pressure is wrong lol

[@happinessgood2894]

Your learning is best

[@InfinityLearn_NEET]

Thank you for your comment. Happy Learning :)

[@zanick2]

the pressure has nothing to do with the buoyant force. water is incompressible, so the mass that the bottle or object displaces is constant at any depth. the buoyant force is the displaced density x volume x gravity. minus the weight of the object.

[@rakeshjain383]

thank you so much don't memorize with your help I can understand all concepts

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You are most welcome, Rakesh! We are glad our videos help you clear your doubts. Keep watching! 🙂🙂

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Thank...

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Ooookkk

[@tiyasamondal1191]

this video is very helpful

[@definitionsinurdu2646]

Very nicely explained

[@leenshakhshir3968]

Thank you so much! I have one question, though: if the force at the bottom is more than at the top, then why is the box sinking?

[@arunraj5358]

what will happen if we put an object at the bottom of container with no fluid below the object.. direction of buoyancy will be upward or downward??

[@neelkamalgupta8530]

I LEARN MORE FROM NET AND LESS FROM BOOK BY SEEING THESE VIDEOS.....

[@nikhataziz4513]

Mam, make a video on tension force

[@appleaipei4150]

I don't understand the video between 1:00 and 1:23. "Now because the pressure increases as we go deeper, the force exerted upward due to the pressure will be more than the pressure exerted downwards due to the pressure, so the force exerted on the bottom of the object due to pressure will be more than the force exerted on the top. So this net upward force exerted on objects submerged in fluids is called the buoyant force." A puzzle piece is missing in this statement.

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We were learning Force in my class, this video really helps me a lot!

[@kheziavolca9613]

I learn Magnetic air resistance gravity friction too

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good type for understanding

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[@noobff1041]

Like target 100k

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Nice example...

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[@Neetaspirant-f2g]

Ūñdèrstood the concept.. Tq

[@geetanjalishaligram2021]

What about the force exerted by the base of container

[@AminderSingh-y6f]

Class 9 ... here?

[@ultimatetrolls7871]

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[@harrybhullar9319]

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[@typingmaster10typingmaster26]

Thanks for ur efforts it makes simpler as seems in books

[@xdgamingpro3852]

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[@realsolo5569]

viscosity is the thickness of a fluid - girth!!!

[@plamenaero83]

why upward force increases when bottle is deeper in the water?

[@kimia1664]

Plamen Iliev because as you go deeper, the water pressure increases.

[@MrSounder10]

I doesn't, theres a mistake.

[@d.2542]

@@MrSounder10 lmfao there isnt a mistake. Go to the beach and test it yourself

[@betacarotene5980]

I'm fairly certain it doesn't. At least not much. The buoyant force is caused because the pressure is greater at the bottom of the object than at the top, creating an upward force. While the water pressure does increase as you go down, both the pressure on the bottom and top of the object are increasing. Meaning the total amount of up force isn't necessarily changing. But the buoyant force will increase if the difference between the pressures on the top and bottom are increasing.

[@lasttime500]

Why don't deep sea submarines have a hard time descending down while pressure is extreme there? Wouldn't the upward force be more down there?

[@case_148_]

Submarines are built in a way that they're able to rebel against the pressure exerted deep down the sea :)

[@lasttime500]

​​@@case_148_ Yes, their built to withstand such pressure, But as mentioned in the video, buoyancy also increases with depth (Edit: because of pressure). It'd be harder to push the submarine deeper. That means a deep sea submarine has to be made of materials with incredible density, *FAR* denser than Osmium that is. Humanity hasn't attained such material yet, Osmium is the densest we've got.

[@pankajdeeprawat]

Post video on floatation

[@tapandplay3234]

Mam, Sometimes i Bath I Push a Mug to Water In Downward force SOmes Huge Bubbles come out side Can You tell Why

[@mrcrispygamer1676]

I feel bad for the dude's toes, he just wants to make a video

[@Broccoli6793]

2:16 the spelling of pressure is wrong lol

[@sarahiiny1878]

lolllllll

[@Broccoli6793]

@David Enatoh what's that suppose to mean?

[@VulcanPlayzz]

which man

[@satwikak1425]

I love the examples you give!! They are very practical and easy to understand

[@InfinityLearn_NEET]

Thank you so much Satwika for your appreciation. We are glad that you understood the concept. For more videos, please visit our website - dontmemorise.com/

[@ari7852]

In the past, Im actually hating Physics because its gotta be hard. But now, Physics seems interesting and worth to learn since you can apply what you learn in reality. Good video, 10/10

[@likithmj9672]

Nice teaching

[@mohdsalimsheikh7134]

teaching level is so good tks for making physics easier

[@brd8764]

Buoyancy and potential gradient.

[@sufitalks5234]

question:WHY DOES HUMAN BODY SINK IN WATER ACCORDING TO BUOYANCY?

[@anishasabnam4130]

Why a living person sinks? A person only starts to sink into the water when the air in his lungs is replaced with water. Once the body is submerged under the water, then the body stays under the water until the bacteria in the gut and the cavity in the chest can produce enough gases such as methane, hydrogen sulfide, and carbon dioxide in order to float on the surface of the water like a balloon. The building up of these particular gases in a human body can take up to weeks sometimes, also depending on various other factors. What happens when a person sinks? When the body is submerged then it does not necessarily mean that all the body parts are inflated at the same time. First, the torso part of the body which consists of most of the bacteria get bloated more than the head and the limbs. The process of buoyancy comes into play now. The parts of the body which are most buoyant rise first, leaving the head and the limbs to be dragged from behind the chest and the abdomen. Since the limbs and the head can only drape forward from the body, the corpses tend to rotate such that the torso floats face-down with the arms and legs hanging under it.

[@dr.athilakshmiram5474]

@@anishasabnam4130 woaaaah😮

[@SJ-gx2zo]

does bouyancy work without atmospheric pressure??

[@Someone38482]

s jamatia no because there’s no gravitational force

[@gokuld9346]

Vaipilla raja

[@quaternarytetrad4039]

Short answer, yes, it does. To help illustrate why, we can use our atmosphere itself as an example, since gasses and liquids both are governed by fluid dynamics. To put it simply, our atmosphere has increased pressure the closer to sea level you get, while it has decreased pressure the farther from sea level you get. What exists at the edges of the thinnest wisps of our atmosphere? Outer space! And most of outer space is a hard vacuum

[@srimathithakoor6881]

Both pin and wood will float if you are taking about surface tension...

[@vickeykumaryadav4156]

Outstanding