Archimedes Principle, Buoyant Force, Basic Introduction - Buoyancy & Density - Fluid Statics

[@TheOrganicChemistryTutor]

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[@samrahmohamed2332]

Md. Kamrul Islam could you please tell me the upthrust force is it an example of second law or third law of motion?

[@Sibasish07]

@@samrahmohamed2332 third law of motion

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[@heidetenchavez9911]

Key Questions in video: 0:37 Is it easier to lift the block in air or is it easier to lift up a block if it's submerged 1:40 What is the tension force in the rope if the block is in a vacuum? 2:43 What is the tension force if the block is in air? 4:11 How do we calculate the buoyant force?

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[@rizkaapriliani733]

hi sir, first of all thanks for the video, it really helps! but i'm confused about the 9:49 part. isnt the V the volume of the silinder? and the density is the densiry of the water right? then how come the two of that multiplied equals the mass of the fluid?

[@sebastiangottlieb1527]

Well yeah V is the volume of the cylinder, but that also makes V the volume of the water it displaces, which is what you need to calculate

[@unlimitedprojects3087]

You are amazing! Finally buoyant force understood : )

[@mikebaee7731]

really loved that explanation of boyancy with the cylinder in the deep / shallow water.. this is my life now, getting excited about understanding science - I'm ok with it

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[@angeliaclemons755]

Do we include bouyant force for any object suspended in air? I’ve never learned that before

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[@nourfouad2075]

thanks a lot finally the buoyant force has understood

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[@retsonnganalimo]

Thanks for the good explanation

[@hosseinrohani5087]

Well explained. Thank you

[@thabanimbatha5235]

phenomenal video.....my question is does a mass an object submerged multiply by it density give us a volume of a fluid displaced?....

[@CyberTitan-dy3gy]

I can't explain it theoretically, but no- the unit of volume is m³. Mass × density would be kilogram × kilogram per metre cubed and work out as kg²/m³. In physics, as a general rule, if the units don't work out then the formula is wrong. Don't want to say too much and ill-advise you, but hope that helped :)

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Excellent! Helped a lot :)

[@alephnull6691]

And this is known as organic chemistry.

[@nicoyreid1003]

2:30 why is g 9.8 and not 0

[@SubjectSigma18]

Earth's gravity is 9'8

[@sccm100]

2:57 I hope this is not a stupid question but why does air push the block up? What about air pressure from above? and the sides?

[@marwaaskar1569]

The air pushes it both from up and down, but from down its more significant thats why Fb pushes it from down to upward direction

[@sccm100]

@@marwaaskar1569 why is it more significant from down? when it's above you doesn't it have the whole weight of the atmosphere?

[@PaulTiberghien]

@@sccm100 because compared to the point above the block there is more air above the point below. In other words, there is more weight (of the air) at the point below meaning the pressure is greater.

[@SanjaySingh-uu8zf]

Hello i have a doubt that mg +the F1 would be acting downwards ?

[@redus202]

a) A floating platform is to be anchored in one of the water-sports lake areas to be used as mooring pontoon for safety and rescue boats. It is proposed to anchor the platform to the lake-bed using a makeshift anchor consisting of a lump of cast iron of volume0.5m3, and a length of thin steel cable. Assuming the cable remains vertical and has negligible weight, calculate the tension in it due to the anchor.Take the cast iron density to be 7850 kg/m3 and the density of water to be 1000 kg/m3. can you help me with this please?

[@nick2232]

no

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[@samrahmohamed2332]

Which law of motion does upthrust force related please

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Amazing!

[@chrisklugh]

Can you explain to me why a cylinder or container that has a vacuum in it wont float? Or to put some context to it, why do we use helium to float a blimp (I get that) but we don't use an internal vacuum instead of a gas?

[@shamiraidora8120]

greattt, so detailll

[@alexanderalbertogarciavand2830]

What is the box is a open metal box of 20 tonnes? When submerging water will go inside the box... do we have to add the weight of the water + the weight of the metal box?

[@jacott1382]

I have a question. So the gravitational force is equal to the bouyancy force (Fz = Fb), but the block and water have two completely different densities, so how does that work?

[@hayatullah3135]

at 5:50 why F2 is greater than F1?? any solid reason plz

[@christalloidmawele5478]

The pressure is greater at the bottom than at the top and thus a greater force.

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[@naylonaylo5954]

Wouldnt the water above the immersed object exert pressure upon it? It actually supports the water above it? Or does the ground under the object support the water above it? Can i send you drawn problems which you may solve and explain to me logically.

[@ThatOneOddGuy]

10:39 for b) I think the answer is ~97.9513N = T

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[@Riinaj_Trading]

what if we are trying to find the force exerted on a circular window like for example a submarine window. given the density of seawater and radius only? Is the Area the same with either the force acting at top and bottom? given that the surface of the window is flat and submerged vertically.

[@yaweli2968]

What if you have a heavy block sitting on a wood that is partially submerged in water. You know the height of the block and the area of the wood. How do you find the height for the part submerged in water.

[@ziadaldohaim3142]

P= m/v. In this case Fb=W, I suppose you are given the weight(m*g=w), and you have the density. Therefore w= V*p*g. If you already have the Length and width, Make V= l*w*h (h is the submerged part); and solve.

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I have no words

[@keepgoiiiingggg]

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[@Dinfes2]

so in the first example we are working with liquid oxygen? since I think air at room temperature is gas, but im not sure.

[@yukilovesf1]

He said fluid, not liquid. Fluids include both liquids and gases.

[@saradeek2874]

But shouldn't F1 be greater as you go deeper? Since the amount of water above you is greater thus more pressure, please can you explain

[@GPStan2157]

F2 is greater as you go deeper because the deeper the object goes, the more force it has because the pressure is greater.

[@mickzomer2470]

if an object has different side surfaces (m2), does it matter for the buoyant force? I mean if you’d put a stick in the water vertically it has way less upward force than if you’d put it in horizontally. While the weight (water displacement) stays the same?

[@mickzomer2470]

@WhatTheHell AmIDoingWithMyLife but if the pressure exerted by the object changes, the pressure exerted by the water should also right? And since that’s the bouyant force, I dont get it

[@bilalrahim2076]

guys does he have a video on absolute viscosity ?

[@isaacnewton4145]

You mentioned Fb is F2 - F1. It means F2 is greater than F1. How can FB be in the upward direction? It has to be in downward direction right? Am I missing something in interpretation 🤔

[@mahakhan3297]

I’m still confused on where and why you multiplied 9.8 by 10 at 2:42

[@jackpach5323]

it's acceleration due to gravity (g) which is equal to 9.8 m/s^2

[@treeislife93]

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?

[@fanimeproductionst.v.3735]

1. Cold water is denser. 2. Don't qoute me on this but I think it depends on the density of the object 3. Yes, but the increase in buoyancy is minimal 4. Again I think this depends on the object being submerged.

[@ZULFERISYAHPUTRA]

Dear Sir............Example Problem : One hydraulic cylinder, the end is connected to the Threaded rod so that it can be rotated. Cylinders with a bore size of 18 mm, 10 mm rod and a stroke of 300 mm single acting in a condition that is filled with oil. If the cylinder is rotated 10 mm. a. How to calculate it b. What is the gauge pressure

[@gidi6066]

9:43 how can u cancel out volume(liquid) with volume (object), Fb= density(fluid) x volume (object) x gravity Fb = [ mass(fluid)/volume(fluid) ] x volume (object) x gravity ^^ so how did u come to Fb = mass(fluid) x gravity ^^

[@markmarkson3047]

In the second step. Since volume of the fluid is in the denominator and it’s being multiplied by volume of the object, they are equal so they cancel out leaving Fb=mass(fluid)xgravity

[@gidi6066]

@@markmarkson3047 oo I see, so it's basically volume of the fluid (displaced) which is equal to the volume of the object. Got it, the formula wasn't clear on volume of what ( liquid or displaced liquid )

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[@primsiren1360]

i'm confused. if the upthrust is proportional to the weight of water displaced, surely heavy objects should float because they have a high mass, and therefore a large weight. Is it to do with the volume to mass ratio?

[@nosir1479]

The upthrust exerted on the object is precisely equal to the weight of water displaced. When an object is placed in water, the weight force of the object is acting against the upthrust force on the object. If you increase the mass of the object, you increase its weight, so a greater weight of the object acts against the upthrust. If the object is heavy enough, the weight of the object will be greater than the upthrust so it sinks

[@tin5394]

seni seviyorum

[@learningschool9356]

Why is the pressure on the bottom surface equal to mg/A? I get that there is a pressure on the bottom but I don’t get why it’s equal to mg/A

[@mufidhmuhsin2314]

The force acting on it is the object’s weight and weight is equal to mg. The formula for pressure is F/A. So P=mg/A

[@yaweli2968]

You Learn Education pressure is force/Area and the force is weight=mg.divide weigh by Area.

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The weight of the block is mg. Where do you get "mg"? "So the mass is 10kg" - explain how you calculated that 10kg.

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