Fluids in 1 Shot | Pressure | Buoyancy | Archimedes' Principle | Class 9 | NCERT | Sprint

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❤️ Padhai Karte Rahe, All The Very Best 👍

[@pragatigond5291]

Sir, if all students find teacher like you then every student started love to study.

[@shubhamsinghroha6652]

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[@Memories-wj1kj]

Seriously ❤

[@SukritiguptaSukritigupta]

Mostly physics.. 🎉🎉

[@chandrapalsinghc.p.s3294]

you are a right

[@chandrapalsinghc.p.s3294]

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Ultra legends are watching this after 3 years

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Me too

[@abhirajsinghtomar8]

CONCEPTUAL QUESTIONS:ARCHIMEDES PRINCIPLE 1. The air exerts an upward force (buoyant force or up thrust) on our body and makes us slightly lighter than we actually are. So the weight shown on the weighing scale would be less than 42 kg .Thus we can say that our actual weight / mass will be slightly more. 2.The bag of cotton is heavier than the bar of iron. The cotton bag experiences a larger air thrust than the iron bar. Therefore, the weighing machine indicates less weight than its actual weight for the cotton bag. 3.When stones are thrown into water, the water level rises. The density of stones is greater than that of water. When the stones are thrown into the water, they replace the same amount of water as the stones themselves. Hence,the water level rises...... PW student!!!

[@Vedz.Edits.]

Bro but Gravitational force also exert on us, if (w=mg) then (m=w/g)

[@abhirajsinghtomar8]

@@Vedz.Edits. yeah bro!!

[@humanoid_fish]

3rd solution is wrong cause earlier the stone was not displacing water by its volume but by its area so when we throw the stone in water it will although make the water rise up a little but as the mass of boat will be reduced and we'll see the boat rising so we will observe fall in water level.

[@ast_creation4261]

thankyou so much broo

[@Spark18263]

bro i think that that the mass is constant

[@gangaming7209]

8:42 we can see sir's hardwork

[@anshuu_xdd3532]

Conceptual question's answer (1):- it is in reality more than 42 kg...because when we are on weighing machine, the fluid (air) exerts upward thrust on us through our foot(called buoyant force).. So the real mass - buoyant force= mass shown by weighing machine 2nd question:- because cotton has less density,,,so it'll be less heavier when compared with an iron 3rd question:- it'll remain same because when the stones were on the boat then the amount of water displaced by the mass of boat(contain man and all the stones) will equal to that of when he throw all the stones... Dekho bhaiyaa, jab पत्थर boat mei rahega, तब वो जितनी water displace करेगा... और जब वो पत्थर फेंक देगा तो कुल मिलाकर उतना ही water displace होगा।। Kyunki boat की जितनी mass के वजह से जितनी paani बाहर निकल रही थी और उसके बाद saare stones को फेंक देने के बाद हर stone द्वारा diaplace किया हुआ water+ उस boat और इंसान के mass के द्वारा displace किया हुआ water, वो दोनो numerically तो बराबर ही होगी। I hope smjh gye hoge😉.. Ek container mei अगर भैंस को रख कर उसका mass measure किया जाए, फिर उसने गोबर किया, और फिर भैंस का mass plus गोबर का mass दोनो मिलाकर तो भैंस का पुराना वाला mass ही आना है kyunki गोबर भैंस ने ही किया है।।। 😂 just an example Last question's answer:- it'll sinks Because it's density will 50/20 (density= mass/volume) as the density of water is also in g cm^3... So water density will also in g cm^3... (For simplicity).. (Waise bhi g cm^3 is a CGS UNIT) so object density= 50/20 = 2.5 g cm^3 Object density/Water density = 2.5....so it'll sink... Because it's more than 1😊

[@rptcreation892]

Very nice ❤❤❤ Loved it ❤❤❤

[@FIFA.qatar2022.official]

Kya copy kara h?😂

[@natuntalukdarparasarukhetr1692]

2nd galat he

[@natuntalukdarparasarukhetr1692]

As because weight is same in both the object so here density doesn't play any role

[@natuntalukdarparasarukhetr1692]

This from my point of veiw i know you have googled but ......

[@ayushverma9723]

Respected Rakshak sir , We all are requesting you to provide a lecture on sound. We student will be highly thankful for you.

[@vedantshah238]

Yo

[@funandstudy458]

Yes sir

[@IITian_Shivamm]

N goe

[@ritankarpal7190]

The last line should be We, the students will be highly thankful to you.

[@Marvalshorts1818]

Yes bro

[@Misox_68]

19:04 hinsa mein hum wishwas nahi rakhte 30:12 some tips and tricks *lol*

[@LWOS_1]

😂😂😂

[@Saqibfayaz-u7h]

Sir question no 1 answer when a school bag has a strap made of a thin string ,then because of this thin string, the weight of a school bag will follow a very small area of the shoulder of the child This will produce a large pressure on the shoulder for hand of the child. The large pressure makes it very painfull to carry the heavy school bag

[@drawwithpinks0037]

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Rakshak sir is the best

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No doubt

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Not best he is superrr 🔥🔥🔥

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he is ultra Pro max legend superr not only superr

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Thank you sir for such an amazing explanation 😭😭

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15 March

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YES I WILLL

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The best thing i found on youtube is pw . thnks for all the efforts u all teachers are putting to make as comprehend more..

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Legends watching this in 2024😂 39:41

[@rekhadubey8745]

I was searching video on "BUOYANCY" but i didn't found best teacher for explaining this but i finally found your lectures here i understood all topics . Thank you sir😊

[@IITian_Shivamm]

N search 🔍 karat raha

[@ritankarpal7190]

It should be I didn't find but you have mentioned I didn't found that is completely wrong.

[@CartoonKidsCorner-333]

Me too found it as most easy to understand and useful

[@skindoctor2631]

Hi

[@crazyff5176]

Spam

[@wishmv]

18:41 bro has some serious personal issues with Rahul ghandi 💀

[@voyagerecords]

2:32 incorrect

[@pagal3327]

Kya galat hai

[@voyagerecords]

@@pagal3327 pronunciation of buoyancy.. Its delusional

[@mantasha.74]

Legends are watching this after 2 years 😂😂🙃

[@Carbotical334]

Me too

[@drawwithpinks0037]

Same😂

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😂

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18:43 Rakshak sir OP😁😂

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@@thenightking9714 over powered

[@cheeko6166]

EPIC

[@pranshu2op]

Rahul gandhi ka paryayvachi

[@pranshu2op]

Lmao

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15:46 legends have already imagine in their mind 🤣

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Yes😂😂😂😂😅😅😅😂😂

[@abhishekanchal2672]

HEHE NILLU BHAI LOL 🤣🤣!

[@eus5937]

Sir ji please sound chapter bhi pada deejega gurudev apko bhi pata hai vo kitna imp chapter hai

[@madinaislamictvchannel1443]

Sound ch delete hai

[@advitagrawal2013]

18:45 😂😂 Sir said blunt means idiot, which is पर्यावाची of Rahul gandhi Best part 😂😂

[@kanishkmehta8807]

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🤣🤣

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Sir was absolutely right 😂

[@savagepirate]

bro can't believe u guys are studying from a english medium school. Blunt does not mean idiot

[@grutagrawal]

M = 50g V = 20cm^3 S = 1g/cm^3 Relative density = density of object / density of water SO = M/V 50/20 = 2.5g/cm^3 2.5g/cm^3 > 1 ( Sink )

[@kananadijanajatilpschool9920]

bhai unit toh thik karlo

[@abhinvur.8404]

Thrust & Pressure. 3:56 Pressure in fluid. 21:25 Buoyant Force. 31:38 Archimedes Principle. 37:31 Relative Density. 47:37

[@arush1066]

Thanks

[@abhinvur.8404]

Welcome

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Thanqqq

[@nirbhaytiwari6785]

18:44 rahul gandhi ka paryavachi 😂😂😂😂😂😂

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Wahh Kya scene hai😂😂

[@nikitasharma1803]

Lots of love to all the teachers of physics wallah . THANKS SIR..

[@ananyaanddivyanshsingh2350]

As icse being ICSE student it is relatable but in icse there is more vast syllabus

[@Syed-Atif]

yes bro

[@apurvigupta1196]

YES

[@chandrapalsinghc.p.s3294]

yes you are a right

[@aneekghosh3968]

Best teacher I've ever seen . I wish he would have taught all subjects

[@yaspalsinghmaurya7278]

Sir ,make vedio on sound chapter in detailed.

[@handree6998]

hi sir I am your student since from class 9 and you are the best physics teacher i ever seen thankyou sir for teaching as in covid situation

[@poonamagrawal2901]

This was the most doubtful ch for me.. But when I watched this video my all doubts were cleared. Thanks ~pw🤗🤗

[@dollymajumdar7354]

for the third one..the water level won't rise because when the stones were on the boat (which they have been from the start) the water level already rose to its maximum level then itself. No further increase in water level will occur as we are not adding these stones externally or afresh. Whether its thrown in the water or if its on the boat, the weight of the stones will be considered and thus, the level rose right from the start itself. However, if we were to just add these stones later on externally (as in, if those stones were not on the boat from the start) then the water level would have risen. So no, i feel it will remain equal. to answer the second one...the iron bar would be heavier. This is because 100kg= wt. of iron bar= wt. of bag + cotton. Now the bag definitely has some weight of its own so if we subtract that weight from that of the total (100kg) then we will get the weight of only cotton. Weight of cotton alone would be less and thus, comparing that weight of cotton (

[@armyanushkalal]

❤❤😊

[@2027iisc]

second one the explanation is not correct the cotton is experiencing some upthrust so its mass is coming less but in real its mass is more

[@musu_2406]

Sir I became fan after seeing all you're videos..... Sir my all doubts and concepts are clear thank you so much sir....hats off for your lectures because it's very difficult to talk continuously for 1 hr 2 hr..... Love you sir❤❤... And your teaching way is really osm...

[@_Madhur_Official]

Thankqu betaa

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Ma 2023 ma dekha rha hi

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Bhai kis company ke pankhe ban gye ho

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Sir..abhi mene graduation kr liyaa h fir bhi aapke competition ke liye videos dhekh rha hu...kaah jab hum 9th and 10th m hte toh ese teacher hte😔😔

[@arnavraj1230]

Koi na

[@ikramulislamislam7191]

Mindblowing sir if like u teacher will there then there will be no illetrate people in India

[@alijithegreat]

1) More because of atmospheric pressure. 2) Both weigh same, because both mass is same, and we take g to be constant. 3) The level of water will remain same, as the water will rise when the person will lift the rock, and then fall again when he throws it, so it will be the same. Homework: The RDI is 2.5, so the object will sink.

[@Fuckboyzz]

"Rahul gandhi ka partaywachi hai" Line was epic 18:41

[@nileshgarg4599]

Sound wala bhi padha dete jivan me anand aa jata : ) Sir ji new chashma . Ohhhhhhhh 😎🤓

[@abhishekanchal2672]

PADHA DIYA NILLU BALAK !

[@Commie_Crucifier]

Sir bas isi ki kami thi Bas Sound aur kara do

[@S10-l8j]

2) the weight of the cotton is more but it feels to be less because the upthrust force is acting more on the bag of cotton

[@hemant_kumar_12349]

P is inversely proportional to area, so you can say the area of cotton is more than iron. Hence the iron is heavier than cotton.

[@hemant_kumar_12349]

But you are ✅ Bro

[@mdules8424]

Relative density Q no 2)= we know that density=mass/volume. so density of substance= 2.5g/cm^3. now relative density=density of substance / density of water. so relative density= 2.5/1=2.5 . As relative density>1,so substance will sink.

[@Devil_gaming_681]

Basically weighing machine measure normal force. It measure Kg-force. Hint: weighing machine measures the amount of normal acts upon it. In ideal situation, when we stand on a weighing machine, our weight acts downwards due to gravity, while upthrust due to air acts upwards as we as a body displace the amount of air as we stand upon the weighing machine. This upward force is the buoyant force. As a result, the body gets pushed slightly upwards, causing the weighing machine to show a reading less than the actual value. Thus, the weighing machine measures our apparent weight, which is less than the true weight. The actual mass will be more than 42 kg.

[@aadyasingh1992]

Hw Q1) weight is shown less on the machine Reasoning: air is a fluid and exerts pressure while the gravity of the earth acts on us. This causes upthrust and leads to lossing in the weight on the machine Q2) iron reasoning air particles are tightly packed in iron and has no air spaces and as a result is more dense than cotton. This leads the iron to hv more weight. Q3) the level of water will rise Reasoning: stones are heavier than water and sink. So according to archimedes' principle the level rises. Sir please tell if the answer is correct Comment by Aadya Singh class 7 And sir your sessions are always amazing thank you so much for putting so much effort for making us understand

[@ach_abhinav]

The pressure exerts in cotton is more because of densile in class 11th you will understand it better of also directly proportional to it's surface area - area or volume..., 2nd one be the density mass of the volume (cubed).

[@aqibbeig7763]

No it is wrong

[@aqibbeig7763]

Q no 2 wrong answer

[@saltanatparveen2702]

The weighing machine gives output in kg and as kg is S.I unit of "mass" It's telling us our mass, because it's has a small microcontroller in it which has been programmed to gives us the mass because when we stand 🧍on it we give it mg so after calculating it's telling us our mass. So for calculating it must have to divide the value ie mg by g but the value of g varies with places so there is no constant value of g. So the weighing machine cannot give accurate mass

[@ajayVerma-es8cp]

REALITY, WEIGHING MACHINE MEASURES NORMAL FORCE ..

[@sanyogitasingh341]

15:43 bahut chalu bacchein hain was the best 🤣🤣. Anyways Thank u so much sir this is the first time I understood something in physics🙏🙏.

[@dildeewane4552]

1:00:12 - 3 question The water will Rise because the stones have volume which is displacing water's volume.

[@suhanaparveen301]

Nhi dildeewane bhai water ka jo level hai wo same rhega q ki Pani ke upar nao aur nao ke uper patthar to patthar ka volume v to nao mai add hua issi liye agar hamlog patthar ko Lake mai dalenge to nao ka to force ghat jayega agar hamlog bahar se patthar fekte to bhale bol skte thhe ki Pani ka volume rise karega

[@Sanatandharam-sp4rx]

Give attendance those who watch after 10 for 11😂😂

[@satishsomewad3929]

😅😅😅😅

[@s.ngaming2952]

😅😅😅

[@randeepsingh2385]

1.Weight is depicted less due to atmospheric pressure of about 200,000N acting on our body of roughly area 2m^2 2.Weight of both should have been same due mass being equal but volume of cotton will be more therefore atmospheric pressure acting on it will be more. 3.Yes, due to the pond being an enclosed area, no. of heavy stones being thrown would result in an increase in level of the water.

[@spgaming4904]

bro how would the level increase as when u were sitting on the boat you stiil had the mass of stones and when u throw them the water level will not rise

[@ojasarora1406]

Very well explained sir Thank you so much 👍

[@pratimsaha7684]

hw question 1 A weighing machine measures the weight of a body and is calibrated to show mass. When we stand on a weighing machine, our weight acts downwards while upthrust due to air acts upwards. So, due to upthrust, the body appears to lose some weight. As a result, our apparent weight becomes less than the true weight. The weighing machine measures this apparent weight, and hence the mass indicated by it is less than the actual mass.

[@aaravdubgotra5454]

Yes🎉

[@mashirmarghoob403]

This teacher is awesome 😎👍

[@shyamsharma_]

Sir in the Archimedes principle question 3 the water level will increase because the body loses its weight when immersed completely or partially the loss of weight of the body in a fluid is equal to the upthrust or the buoyant force Upthrust or buoyant force or weight of fluid displaced by a body is equal to of body in air or weight of body in fluid

[@nidhijain3720]

Sir you are outstanding! Very nice explanation of all the topics. Big fan of your teaching.

[@S10-l8j]

3) the level of the water will increase because the solid will occupy the space of water and the level of water will rise

[@ashutoshkhuntia715]

We r proud to being taught from u ...... without cost this is a nice platform.......I salute PHYSICAL WALLAH !!

[@smartstudyzoneforyou2444]

Its phyics wallah not physical wallah

[@samriddhisinha3278]

Yeah ! Lol ones ....

[@Devilwho-f2x]

Well we have already been taught the concept of vector perpendiculars Yeah in ICSE board we study this in 9th itself

[@aradhyashakya2777]

And me from icse still here😂😂

[@Devilwho-f2x]

@@aradhyashakya2777lmao, m in 10th now

[@manishbhopal6416]

Sir meri ek request hai kya app ab jo 10th ke liye batch shuru karoge toh kya aap usme olympiad level ko aur aache se touch karoge...... Please if you agree..So That sir can see this comment and give their attention on this. Thank you🙏

[@ranadeepbanerjee5309]

Clapping before watching.... promo says it all 👏👏👏👏👏👏🙏🙏🙏

[@AtulSingh-hr2jp]

Starting is enthusiastic ❤️🔥😎

[@nileshgarg4599]

Right Agree !!!!

[@shreya....kaushik8241]

(18:41) That Rahul Gandhi ka paryavachi h was epic ;)

[@Abhay18vk]

Usse agla bhi mst tha... Hm hinsa m vishwas ni rkhte 😅

[@ramanandsingh1878]

Ans.1 weight is more because external force is applied. Ans.2 It is more. Ans.3 Water rises up

[@fanclub4057]

Very well explained sir 👍 Thank you so much 🎉💞

[@yours_iqra959]

Sir Thanku so much for this video because in 2022_23 the Syalllbus are not reduced so this very useful. Thanku once again. 🙏

[@faixu496]

❤❤

[@faixu496]

Why

[@faixu496]

❤❤

[@deepalimishra8020]

Sir sound bhi kra dijiye please 🙏🙏🙏 The bag of iron will be more heavier to hold as it would have less surface area in comparison to the cottons bag. Therefore irons bag would exert more pressure.

[@nawinkumar8486]

18:44 best part😂

[@pradiate]

🤣🤣

[@Soravjoshii]

1.00.00. Question 3ed wala ka answer ha Water level will increase because According to archimedes principle the stone's take place in water and water will be rises

[@funtime4593]

sir amazing explanation u taught in a very easy language n with examples which helps alot to remember the concepts

[@veenayadav5753]

Though this is deleted by CBSE, at least someone is interested in teaching it! Massive thanks Physics wallah!

[@kauneditor]

Yes

[@nikhilmaurya2837]

Sir please explain the chapter- "Sound" also

[@naveedahmadkhan4448]

See the playlist

[@ayushpatel020]

@@naveedahmadkhan4448 link

[@jasminejazz795]

Q. 3) If something is submerged in water, it will displace an amount of water equal to its volume. If something is floating in water it will displace an amount of water equal to Its weight. Initially, stone and boat is floating so, water displace is equal to the weight of stone + weight of boat Now, stone is dropped in water but boat is still floating. So, now Volume of water displaced=weight of boat+ volume of stone We know that density of stone is greater than that of water Density=mass/volume As density is higher of stone its volume will be less. So, volume of water displaced in second case when the stone is dropped is less than when boat is filled with stones. So, water level will drop/fall when you throw stone in water.

[@ojaswinipurohit8]

i have a doubt... 26:00 what if the pot is filled with fine sugar particles or salt ? it will start to come out from the holes...what does it mean? maybe because solid particles are way too small in size than the hole ?

[@Aakarsh_Srivastava]

Solids are rigid, not fluid. Only fluids exerts pressure on the walls of their container.

[@laxmipriyamohanty1370]

YOU MAKE THE CHAPTER SO EASY AS A SIMPLE WAY

[@startupindia9734]

Atq, A. Less B. Cotton because it has large surface area. C. Water will rise because solid will immerse in water

[@onepenonetab6663]

70 views 80 likes 🙄😳😳😹😹 power of Rakshak sir

[@avnidubay7883]

Ans-b: Iron is greater than cotton because iron covered by big surface ...🙏 Ans C: ecause object applied by buoyant force.🙏....

[@akhilgoyan4742]

2024 attendence here😂

[@ArunaAtrey]

Present

[@PremSinghNUHM]

Present

[@DL_RAGHAV_106]

absent [state- already passed]

[@MdRehanRaza-vn6fi]

Present 😂😂😂

[@Harsh.521]

Present

[@mumtazalam5985]

Q1 42kg has real weight Q2 Iron has high density Q3 water labels not rise

[@ayushverma9723]

Thanks sir for providing awesome lecture on fluid mechanics

[@roh780]

18:45 Le rahul gandhi : gajab beizzati hai

[@LADDU-GOPAL..839]

1 answer= no our weight is heavier than the weight shown in weighing machine because the buoyant force acting on fluids this force can make our weight less as actual.

[@LADDU-GOPAL..839]

Here fluids is as air

[@VijayaGupta123]

Stone has some volume and according to Archimedes principle volume of the stone = the weight of the displaced water . Therefore the level of water will rise surely

[@VnM-vm3wm]

but wont the volume still be present when the stone is in the boat, if thats the case the level wont rise

[@dinklekriplani]

Factors affecting bouncy........ pls ye bhi banao video ......

[@BHASKARKOLI]

1. Volume of an object 2. How much liquid is displaced by the object 3. Mg or the gravity pull acting on the object

[@kishansinghrana5181]

Agar maine Archimedes principle sahi bola toe like karna warna dislike .......karna Archimedes principle state that when a body is immersed partially or completely in a liquid it's experiences an upthrust which is equal to the weight of the liquid displaced by it

[@kusumkatariya2302]

Archimedes principle When an object is immersed in a liquid it experience a buoyant force which is equal to the weight of liquid dispenced

[@RpShrivastava-v4u]

Isi tarah daldal me jab ham khade hote hai to jaldi doobte hai aur jab let kar nikalne ki koshish karte hai to pressure Kam lagta hai aur ham bahar nikal sakte hai

[@ArnavSharma-o5n]

1 less than 42 kg 2 100 kg iron is heavy 3 it rises because the stone take space of water hence the level of water rises

[@sunilkumartiwari65]

Legends watching 1 day before their exam

[@haryaligaming2098]

Sir i love you you are teaching to much much good. When you were teaching then all topics is automatically comes in my mind permanently .

[@kusumkatariya2302]

The force which liquid exerts in upward direction on an object is called buoyancy

[@Kshitij96]

A-3)The level of pond will not rise as of the stones were already kept in the boat which was in pond itself.

[@ashpreetkaur...26]

Q1 the wieght will be more as air is also fluid so some amount of buyont force is applied on it

[@shashank5451]

54:18 cm sq nahi m sq

[@p2astagopal..539]

Are aage m sq kar diye hai bhai

[@saarthakbharwal7872]

I think the reason for the first case can also be that when we are standing on a weighing machine the air also exerts some on us therefore we see our wieght more but actually it is less....

[@dhriti18]

dann it means u r 99 kg now be happy xD

[@purnimamondal3986]

w= m into g if weight is 42 kg means mass into 9.8 = 48 kg so offcourse mass will be less

[@princeyadavvlogs4467]

Upthrust ka name suna ha😂

[@syednaqvi2340]

Just try this: change the playback speed to 0.25x slower then sir sounds like rancho in 3 idiots Free Free Free

[@ushapal2041]

Q1 mass on weighing machine is found by finding the weight of an object and then dividing it by gravity So, If we go into swimming pool due to buoyant force being in upward direction the net force of gravity and buoyant force will result in a less force. So our mass is lesser than 42 kg Q2 Iron bar is heavier because it applying more pressure than the bag of cotton as its area is lesser than bag of cotton. Q3 A person sitting on boat throws stone in the pond so the stone will take space in the pond and the water of pond will rise.

[@leelasingh986]

18:40 sir literally roasted rahul gandhi 🤣🤣🤣

[@hellgaming7720]

Sir i have a question?........which method of studying is best.. online studies or class room studies.....please answer me

[@rsshmbbswala2495]

Class room study

[@debabrata81]

1. less 2. Iron is heavier because it is a solid iron bar which exerts higher pressure than a bag of cotton. 3. The level of water will rise.

[@pramodpandey1451]

Sir, sound chapter vi kra dijiye please 🙏🙏🙏🙏