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

This physics / fluid mechanics video tutorial provides a basic introduction into archimedes principle and buoyancy. It explains how to calculate the upward buoyant force acting on an object and it shows how to derive the buoyant force formula. It discusses how to use free body diagrams to calculate the tension force in a rope supporting a block in the fluid using the buoyancy force and the weight force of the block.
Mercury Barometer Problems:
• Mercury Barometer Prob...
Open Tube Manometer:
• Open Tube Manometer, B...
U Tube Manometers:
• U Tube Manometers - Pr...
Buoyant Force of Helium Balloon:
• How To Calculate The B...
Physics - Intro to Buoyancy:
• Physics - Intro to Buo...
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Apparent Weight and Apparent Mass:
• Apparent Weight Physic...
Fractional Volume of Submerged Object:
• How To Calculate The F...
Hydrometer Physics Problems:
• Hydrometer Physics Pro...
Volume Flow Rate and Mass Flow Rate:
• Volume Flow Rate & Mas...
Equation of Continuity:
• Continuity Equation, V...
Bernoulli's Equation:
• Bernoulli's Equation E...
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Torricelli's Theorem & Speed of Efflux:
• Torricelli's Theorem &...
Venturi Meter Problems:
• Venturi Meter Problems...
Dynamic Lift Force:
• Dynamic Lift Force on ...
Viscosity of Fluids and Velocity Gradient:
• Viscosity of Fluids & ...
Full-Length Videos and Worksheets:
/ collections
Physics PDF Worksheets:
www.video-tutor.net/physics-b...

[@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?

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@@samrahmohamed2332 third law of motion

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You are amazing! Finally buoyant force understood : )

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Thank you for this video it helped understand this formula more

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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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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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[@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.

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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?

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[@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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[@SanjaySingh-uu8zf]

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

[@samrahmohamed2332]

Which law of motion does upthrust force related please

[@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?

[@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.

[@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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[@nicholasgabaldon657]

can someone explain to me why the change in pressure equals mg. Thanks!

[@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.

[@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?

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[@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

[@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?

[@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

[@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

[@allistermugaisi1625]

may God bless you

[@batoolnetwork9699]

Ty

[@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 🤔

[@alephnull6691]

And this is known as organic chemistry.

[@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

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guys does he have a video on absolute viscosity ?

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I have no words

[@ahmedabdelalim3810]

i just wondering why the tension dont becomes zero because it equals the force minus weight and they are equal according archimedes principle

[@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.

[@BB-qe1fc]

Did u tutor at Nova Southeastern?

[@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.

[@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.

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Is there any topic that is connected to this lesson? Of course the video is good, nothing wrong but myself, I didnt understand. LOL I HAVE ONLINE FINAL EXAMINATION THIS WEEK.

[@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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Yes

[@user-xz6nm1tx5h]

😇what if the a question was like this [A 10.0-kg block of metal measuring 12.0 cm, 10.0 cm and 10.0 cm is suspended from a scale and immersed in water as in Figure 1. The 12.0- cm dimension is vertical, and the top of the block is 5.00 cm below the surface of the water. Take P_atm=1.013×10^13 N/m^2 and ρ_water=10^3 kg/m^3 i. What are the forces acting on the top and on the bottom of the block ii. What is the reading of the spring scale? iii. Show that the buoyant force equals the difference between the forces at the top and bottom of the block.] how can one answer it.

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[@odinambaikenna2212]

Sir I do almost everything But why did u use the density of water instead of air

[@odinambaikenna2212]

Sorry density of aluminum not water

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