Gravitation 01 | Universal Law of Gravitation | Class 9 | NCERT | Sprint

[@PW-Foundation]

📝Download Lecture Notes From PhysicsWallah App : bit.ly/2SHIPW6 🎯 Science group- t.me/joinchat/RYszj_1cAl8xEvnv 🎯 Social Science- t.me/joinchat/GCBE5bDgFdxrZeI8 🎯 Mathematics group- t.me/joinchat/GBbG4p5S_OVRV920 ----------------------------------------------------------------------------- 🗓️ Scheduled Syllabus For Sprint ( Class 9th ) released describing which topics will be taught for how many days. Available at PhysicsWallah App :bit.ly/2SHIPW6 •Duration:-1 month (Jan 2021 - Feb 2021) 🎉 Free Batch Exclusive on our KZbin Channel : Physics Wallah Foundation - 9 & 10 •Batch Details : 1) Best Faculties across India for different Subject/Topics. 2) Complete & Relevant Syllabus Coverage of Class 9th within 1 Month - Fastrack January 4,2021- February 15,2021 3) Monday - Saturday : Scheduled Classes everyday. •Physics : Tuesday, Saturday •Chemistry : Wednesday , Friday •Mathematics : Monday, Wednesday, Friday •Biology : Wednesday , Thursday , Saturday •S.ST : Tuesday, Thursday, Saturday, Sunday 4) Scheduled Syllabus released describing which topics will be taught for how many days. Available at PhysicsWallah App :bit.ly/2SHIPW6 ----------------------------------------------------------------------------- OUR SOCIAL MEDIA PROFILES : ⭐Instagram Handle : instagram.com/physicswallah/ ⭐Facebook Page: facebook.com/physicswallah ⭐Twitter Account : twitter.com/PhysicswallahAP?s=20 ⭐ PW App on Google Play Store : bit.ly/2SHIPW6 ❤️ Padhai Karte Rahe, All The Very Best 👍

[@REGEDIT-XD2]

Lol

[@mrpanda2498]

Sir Challenger question ka answer hai step by step: 1:F'=2F. 2(i):F=F'/4 and 2(ii):F=F'/9. 3:F=4F'.

[@himanshuyadav1247]

Sir live study kara do please 🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏🙏

[@brokenhutgaming3749]

@@himanshuyadav1247 menti sangram coming on 14 aug @6pm sur would live and team rakshak sir would win!!!

[@kimjong-un9914]

@@himanshuyadav1247bhai. Sahab MATLAB kya he apka

[@memelegends6057]

Newtons 4th law of motion :- A book remains in the state of rest and covered with dust until and unless internal and external exams appeared and then the speed of turning pages is directly proportional to the syllabus covered and the tension in the mind remains constant

[@shakuladevi8103]

Wah kitne tejaswi log hai yaha pe

[@18-kamyapatelviii-c79]

This law is better than Newton's law.

[@shakshisingh3819]

Aj ke newton bro tumhe toh apple girne time rehna chahiye tha newton ki jagah toh to mein soch bhi nahi sakti kaise kaise law bante 🤣

[@tansviutane3054]

@@18-kamyapatelviii-c79 sorry but don't say anything wrong about isaac Newton or any other scientist he struggle very hard for that law you can't imagine.

[@18-kamyapatelviii-c79]

@@tansviutane3054 Oh I am not saying this is wrong but in new edition of class 9 science there it is written.And sorry if you didn't got me.

[@himanshusharma5352]

air also has gravity as particles present in air have mass and every object which has its own mass has gravity too👍

[@deepakadlak1951]

Edited

[@anshulsharma8408]

Answer of challenger: a)F gets doubled when mass of one object is doubled. b)F becomes 1/4 of previous force when doubled. F becomes 1/9 of previous force when tripled. c)F becomes 4 times of previous force when masses of both bodies are doubled. LOVED THE SESSION!

[@DeadGaming69]

Right

[@khushbu5162]

I think these Q are quite easy.

[@kasturipadhi2571]

a

[@shivangtiwari2170]

Same answer corrct

[@rbjaiswal8575]

Right bro but I did it orally 😀

[@Adarsh56687]

Homework questions - Q.1) force of attraction becomes double of the previous force. Q.2) force of attraction becomes 1/4th of the previous force(when distance is doubled) and force of attraction becomes 1/9th of the previous force(when distance is tripled). Q.3) force of attraction becomes 4 times of the previous force. Thank you sir for this wonderful session😊 Love you sir ❤

[@swati_0414]

Same answer thanks😊

[@AyaanKhan-fb4yx]

Challenger questions: 1) Force will be doubled 2) If distance is doubled, force = F/4 If distance is tripled, force = F/9 3) Force will be 4 times the initial force Amazing lecture!❤

[@harshagrawal4165]

Exactly write answers

[@Amanyadav-nw2om]

Bro kaise banaya batana jara

[@Amanyadav-nw2om]

Mere ko bhi Janna hai

[@ComedyDhamaka848]

What is friction

[@swenidh]

Please full solution type kar do , your answer is double and my answer is 4 times , how

[@aryanshinde-student19777]

challenger questions:- 1.ans= The force between two objects is also doubled, if one of it doubled. 2.ans= If the distance between two objects doubled and tripled, so the force between two objects is decreases. 3.ans= if the masses between two objects are doubled so the force also increases. Great Lecture!!!!

[@Aassiiiffaa]

Wah dear Badi intelligent ho ❤

[@yogeshgupta6049]

Sir I want you as my teacher in our school for physics

[@artigupta1780]

@@anandpatel3192 gajab 😂👌

[@tanyasinha7250]

Kuchh bhi ye sir tumhare liye especially nahi aayenge padhane ke liye 😆😆

[@rjplayz6858]

Bro your expectations is big but never come true

[@jaishreeshyamjaisalasarbab7654]

@@artigupta1780 👍

[@oubtribe2276]

Then nobody will fail in science

[@Arijit__singh_7]

According to Newton's second law of motion, the force acting on an object is equal to its mass multiplied by its acceleration (F=ma). Therefore, if the mass of one object is double, the force between the two objects will also double.

[@Surajkr27]

I like the Teaching as You explain in Hindi...Students know English Very Well but still we catch Concept more Readily While Learning In Hindi...That's Why I like This Foundation more Than Bhedantu and Gunacademy...

[@supreme8432]

V'n!n;mm;m

[@IgAditya6698]

🤣🤣🤣🤣🤣gunacademy and bhedantu

[@bhushanpatil6653]

Bhi tu free fire khelte he ky

[@javagaming8036]

😂 op

[@sanaafreen4967]

Hiii bro

[@lakshayjakhar4810]

Challanger Question Ans. 1) Force will be twice 2)Force will be (i)1/4 of previous value...(ii) 1/9 of previous value.. 3)Force will be 4 times..... Thank you sir for great explaination😊😊

[@PAWANSINGH-ml2in]

How you get the answer please reply

[@a2zroutine653]

Challenger question's answer : 1. It will be twice. 2.1/4 of the previous in double and 1/9in triple . 3. 4 times more.

[@RakeshKumar-en2gl]

(i) F'= 2F (ii)If distance are doubled F'=1/4F. If distance are tripled F'=1/9rF (iii)F'=4F Answers of the homework questions.Thanks sir for the best explanation.My all doubts are clear in this video.🙏🙏🙏🙏🙏

[@taehyung286]

Sir's pen is the best example of every chapter 😂

[@mamtakirasoi2008]

🤣🤣😂😂

[@sami_anwer]

😂😂😂😜

[@tanmaysingh5693]

🤣🤣🤣

[@janvi5501]

Sir give best examples with pen

[@furieholl2433]

Adbhut

[@me_the_deepak7000]

Challanger question 1:- F=G.M1.M2/r².....(1) F=G.2M.M2/r².......(2) By dividing eqn 2 by 1 F¹/F=G.2M.M2/r²/G.M1.M2/r² F¹=2F. Answer

[@Totalknowledge-y1n]

U r live in aayodhya

[@architnirula5779]

Very Nice Explanation Sir, pls bring the deleted part also of this chapter

[@ashworldmenia7791]

Really nice teaching

[@vijaybabuofficial7189]

Me tooo

[@agamjotsingh374]

What's with the deleted part ?

[@raoyadav7635]

i have a doubt, That how can you say that if earth attracts moon with a force than the moon attracts the earth with the same force because more will be the mass more will be the force

[@architnirula5779]

@@raoyadav7635 Bruh, when you talk about Gravitational Force, you have the formula F=Gm1m2/r². Basically m1 and m2 are the masses of the two objects b/w which you are finding the gravitational force, so be it Force on earth due to moon or on moon due to earth, it will remain the same. If we talk about the direction, then both the forces act on the opposite bodies. As the mass of moon is less than that of earth, we can see the impact only on moon, but in reality both of them attract each other.

[@Man_of_myth]

8:46 Yes sir Air have Gravity and Gravitational force both because Air is made up of fine particles and all particles have some mass.

[@Gamma_plays]

Can you explain more?

[@raajhasan7491]

@@Gamma_plays you will know when you will read the chapter atoms and molecules. In that chapter the mass of gases(air) are given . Hence we know that air have mass and sir had told that anything that have mass have gravity.

[@mdarham5582]

Thanks to Alakh sir for choosing the great teachers for us.

[@IgAditya6698]

Yes

[@MovitationlHub]

This was my first youtube lecture of physics wallah foundation and I love it. Thank you sir for making this amazing video and make us understand this concept.

[@janardhanyadav1694]

Mera bhi

[@vishnuupadhyay9418]

Me too

[@gameingpro7887]

Me too

[@entertainmenthub2671]

mine too

[@vlogs5242]

Yes me too

[@muaazqazi3114]

Sir Hume school me samjaya nahi, sirf ratta marvaya jata hai . Mam ko verbally Hindi me answer do to bolti hai English mein chahiye .sir pehle mujhe physics se nafrat thi lekin jab se aap padhate ho tab se physics mujhe pasand aane lagi Sir physics wallah ko apni ek school khol leni chahiye jaha pe bacho ko robot jaisa nahi insano jaisa treat Kiya jaye

[@shaheenamuzi]

𝒂𝒂𝒑 𝒌𝒂𝒉𝒂 𝒔𝒆 𝒉𝒐𝒐

[@NotArthurOG]

*Challenger Questions -:* Q. What happens to the force between two objects, if 1) the mass of one object is doubled ? *Sol-:* F = G×M1×M2/r².....(1) F⁰= G×M1× 2M2/r².......(2) Dividing eqⁿ 2 by 1 . Then, F⁰/F = G×M1×2M2/r² ÷ G×M1×M2/r² F⁰/F = 2/1 F⁰= 2F The force will be twice if the mass of one object will doubled. 2) (I) the distance between the object is doubled. *Sol-:* F= G×MI×M2/r².......(1) F⁰= G×M1×M2/4r².......(2) Dividing eqⁿ 2 by 1.Then, F⁰/F = G×M1×M2/4r² ÷ G×M1×M2/r² F⁰/F = 1/4 F⁰ = F/4 The first become one fourth if it's distance doubled. (II) the distance between the object is tripled. *Sol-:* F=G×M1×M2/r².....(1) F⁰=G×M1×M2/9r²........(2) Dividing eqⁿ (2) by (1).Then, F⁰/F = G×M1×M2/9r² ÷ G×M1×M2/r² F⁰/F = 1/9 F⁰= F/9 The force will be one-ninth if the distance will tripled. 3) the masses of both objects are doubled? *Sol-:* F = G×M1×M2/r².........(1) F⁰= G×2×M1×2×M2/r²......(2) Dividing eqⁿ (2) by (1).Then, F⁰/F = G×2×M1×2×M2/r2 ÷ G×M1×M2/r² F⁰/F = 4/1 F⁰ = 4F The force will be 4 times if the mass of both two objects are doubled. Hope ! This is correct 🥰🥰🥰🥰.

[@Anny49558]

Lekin devide kiun karu substraction Kar ke nehi hoge keya ? Please tell me why🙏🙏

[@simranahuja_]

8:35 - Yes, air will also have gravity because it has mass .

[@sadhikareddy6857]

Yes sir air will also have gravity because it has mass

[@rashi7713]

No there is no gravity in air

[@amulyaanand3563]

No because if you weight a balloon with 0 air then weight the balloon which has air in it this will be same

[@simranahuja_]

Hmm...this is a topic to think!!

[@technopranjal4024]

There is no gravity in the air

[@krishnakaushal8834]

Sir session bahot accha tha.

[@dhonidagar8561]

Ya bro

[@kalyanbharatias339]

Yes bro

[@rajivstar99]

yes bro

[@brokenhutgaming3749]

3:06 newton was sitting in his home and watched the tree of apple and a apple fall from tree. Newton thought that why this apple fall only downside, why it's not going upside or in any other direction. Then he discovered the *GRAVITY* . This was written in his *DOCUMENTARY* .

[@taradevi5913]

5 minutes ke incident se itna bada universal law nahi baan gaya khud physics wallah alak pandey ne kha hai

[@krishna290gamer2]

@@taradevi5913 he was working on gravity for a very long time. After this incident may be he got am inspiration or an idea?

[@taradevi5913]

@@krishna290gamer2 exactly that's what I was saying he was working on it for a very long time

[@taradevi5913]

@@krishna290gamer2 you are in 10th now

[@futuregamin9029]

Bhai log tum sahi keh rahe ho sirf apple girne se koi itni badi discovery nahi kar sakta iske peeche bahut saalon ki mehnat hai nahi to hum bhi patang ko udhta dekhke **upravity** bana dete

[@narendrakumar-zs9ew]

Challenger questions: 1) Force will be doubled 2) If distance is doubled, force = F/4 If distance is tripled, force = F/9 3) Force will be 4 times the previous force. Amazing lecture!

[@bestmeme69696]

Challengers question 1) 2 times 2) 1/4 times and 1/9 times 3) 4 times

[@harshichaudhary1021]

Challenger question 1:- force become twice 2:- 1/4 of the previous and 1/9 of the previous 3:- it becomes 4 times

[@atgaming4696]

Yes

[@Renubala07]

Finally I found a navodayan 😂🤣

[@harshichaudhary1021]

@@Renubala07 that's good 😂

[@spgamer3389]

@@harshichaudhary1021 wahh!!

[@harshichaudhary1021]

@@spgamer3389 🤘

[@shivamshekhar9414]

Challenger questions 44:03 Q1 I) Force will become 2 times greater than previous Force II) Forced will become F/4 and F/9 times III) force will become 4 times greater

[@AProfessionalTouch5112]

BaHi mujhe samjhao kasy

[@kapilaggarwal7755]

Are you fool you don't know how to do this 😠😠 khud try kar

[@SureshKumar-sf7jp]

Any one noticed that _kar bhala to ho bhala _Newtown 🥉 law😂😂🎉

[@SureshKumargupta-r6l]

Kya bhai yi Kya hai

[@SureshKumargupta-r6l]

😅😅😅

[@ayushichaturvedi3725]

Always try to give extra information..... Thanku so much sir🙏🙏🙏

[@Vibration-if8mk]

11:45 1)moon revolve because of earth 2)Eart because of sun 3)Sun (soler system) because of supermassive black hole in center of gallexy 4)and gallexy because of center of the mass of gallexy cluster

[@WBS_Rolex6969]

9:50

[@Tae-tan_394]

Sir aapki Physics, biology aur geography bahut achhi hai

[@dularsinghsinha9520]

The hallo bachhoooooooooo is so good 0:01😂😂😅

[@puspanjalimishra7943]

Question 1)- a)- the force is doubled. b)- force becomes 1/4 when radius between the object is doubled and becomes 1/9 when tripled. c)- the force is quadrupled.

[@tamannarathor2689]

Sir you teaches very nice 👍👍👍👍and thanks alot for the video🎥🥰🥰🥰 sir you are the best👍💯👍💯

[@balasaroj1189]

Hii

[@parulmaurya3172]

Yes sir ,Gravity is present in air also. That's why in the lower height pressure is higher and as we go higher the air pressure goes on decrease

[@kavitasingh8909]

Han theek gyaan na baanto 😂

[@akshatnarayansingh2521]

Galat uttar

[@parthsguitarcovers5976]

36:11 , when 6.4 and 6.7 were canceled, all that's left is 60/6.4, which comes out to be 9.3, not 9.8, so that cancellation can't be done in the exam and the whole tedious calculation is required.

[@madhusingh6888]

My answer for this question is coming 6.25 x 10^7 as I took the value of G as 6.67 x 10^-11.. I think their is some mistake in the calculation that sir did. I even rechecked my answer but it was coming same. Pls try it once by putting G=6.67 x 10^-11 and let me know the answer..

[@parthwashere]

you share the same name as me lol

[@onepenonetab6663]

Best explanation by best teacher !!💐💐

[@akshay_anand360]

Yes ❤👍👍

[@princejakhmola6076]

True

[@abhinavjayant9647]

yes

[@NavinKumar-tt6pm]

Very nice and god bless you

[@shubhdeepsingh3005]

Yes

[@aparbhatia6567]

Q1 I) Force will become 2 times greater than previous Force II) Forced will become F/4 and F/9 times III) force will become 4 times greater

[@Irfankhan-bc5wp]

Your teaching is so good as compare to other teachers ❤️

[@thegreatworlda.k1100]

Thank you

[@sweetparkels9185]

Don't compare!

[@Abhicreator9452]

Don't compare

[@rpbplaystudyinggroup1103]

Thank you

[@Chandrakant415]

All R best

[@PalakSingh-om7fz]

Becoz of one apple 🍎 we are studying a huge tricky chapter

[@artwithnimisha8316]

44:02 # Challenges question (I) The force will become doubled (2) A) when doubled force will become 4 times (2)B) when tripled force will become 9 times (3) The force will become 4 times Thank 🙏🙏you sir

[@platinumsword.5368]

Maza aaya

[@tubluntuntu8632]

When doubled force will be 1/4 if previous F And when trippled force will be 1/9 of previous F

[@krishnakaushal8834]

Yes sir air also have gravitation even an all the partical has the gravitational force between them and sir that's why radon is heaviest gas so it is at the lowest level of the ground and hydrogen is the lightest so it is at the top.

[@premsudhasingh6253]

Do air have mass ?

[@premsudhasingh6253]

I think it has

[@atharv4403]

@@premsudhasingh6253 gas has molar mass

[@parthisthatyou]

OP level bhai OP

[@urmiladevi171]

But what about mass??

[@shashisaxena4743]

Challenger Questions:- (1) Fn=2F (2)(i) Fn =F/4 (ii) Fn = F/9 (3) Fn =4F

[@studypagal8120]

Hello 😍😘

[@rajibsinghasingha5100]

@@studypagal8120 bolo behena

[@Sunny_gamer76]

Hlo

[@Sunny_gamer76]

​@@studypagal8120hlo😊

[@Sunny_gamer76]

​@@rajibsinghasingha5100😍

[@YogitaDhaka-u7m]

Kon kon mere sath h ki agar us time Newton ke sir per apple nhi girta to aaj ye gravity nhi pdhni padti please vote for this 😂😂😂😂😂😂😢😢😢😅😅😅😅😅😂😂😂😂😂😂

[@DharmendraMaurya-cu1bf]

Apple ki jagah nariyal girna chahiye tha direct upar 😂

[@Mir-l8u]

😂

[@flyhigh5643]

1.i) 2times of the previous force ii) doubled - 1/4 of previous force Tripled - 1/9 of previous force iii) 4times of previous force

[@乇卂几丂卄]

.

[@PAWANSINGH-ml2in]

How you get the answer please reply

[@priti_thakuria]

Challenger question: 1. Let, Mass of 1 object be doubled=2M New force =G ×2Mm/d² =2×old force If the mass of one object is double the foce is also doubled. 2.If the distance is doubled, distance=2d Then, F=GMm/(2d)² =GMm/4r² =1/4×old force When the distance is doubled the force becomes 1/4 times of the old. 3. if the distance is tripled, distance =3d Then, F=GMm/(3d)² =GMm/9d² =1/9 ×old force When the distance is tripled the force becomes 1/9 times of old force.

[@Tuber_rate]

Amazing

[@iamjaynurrahman1097]

No sis that is not like that

[@jigmetangmo8928]

Thankyou so much sir this video helped me so much 🙏best teacher I have ever seen🙏🙏thankyou for your teaching sir 🙏🙏🙏I appreciate your teaching 🙏

[@sarikasharma6215]

Challenge question 1. If the mass of the object is doubled then the ans is F'=2xF 2. The distance when doubled then the ans is F'=1/4xF The distance when tripled then the ans is F'=1/9xF 3. If the masses of both the object increases the ans is F'=4xF

[@SurendraSingh-ho4vt]

2. If the distance between them is double then the force becomes 1/4 of the previous force . And if the distance between them is triple then the force becomes 1/9 of the previous force.

[@vaibhavmishra3342]

No wrong check out my answers

[@ankitkrsingh8068]

8:45 Yes sir air me bhi gravity h

[@rudrachauhan3497]

𝙋𝙡𝙚𝙖𝙨𝙚 𝙨𝙪𝙗𝙨𝙘𝙧𝙞𝙗𝙚 𝙢𝙚

[@omdwivedi6966]

One of the best teacher of physics I have ever got❤️❤️❤️

[@SadikulSk7551]

1 ka force double hoga 2 ka double distance me force double hoga aur tripled distance me tripled hoga 3 ka force dono same rahega

[@rambhadevi3814]

Physics wallah foundation is the best for students on whole u tube world for study with enjoy......🥰🥰🥰

[@Toiba.56]

Even paid clases won't teach us like this......❤️ Thnku sir 😊

[@Raghav_Tiwari]

Challenger Answers :- 1. New force is 2 times the older one. 2. ☆ New force is 1/4th the older one. ☆New force is 1/9th the older one. 3. The new force is 4 times the older one. Adbhut hai Sir aap.

[@krishnaA_praj001]

Thanks

[@rubixbro7744]

Challenger question answers 1) If one of the masses is doubled then the force will double. 2) If the distance is doubled the the force will become half and if the distance is tripled then the force will be one-third. 3) If the masses are doubled(both the masses) then the force will be quadrupled.

[@SanjayKumar-rx4lp]

Challenger answer 1: if force was F previously it becomes 2F. 2: force will be F/4 and F/9. 3: force will be 4F

[@rudrachauhan3497]

𝙋𝙡𝙚𝙖𝙨𝙚 𝙨𝙪𝙗𝙨𝙘𝙧𝙞𝙗𝙚 𝙢𝙚

[@purva8830.]

Yes sir , Air is applying force on us which is opposite to the gravitational force.

[@madhubancentralschool7294]

Can you examplain more please

[@muaazqazi3114]

Sir physics wallah ko apni ek school khol leni chahiye jaha pe bacho ko robot jaisa nahi ,insano jaisa treat Kiya jaye, ratta nahi samjhaya jaye Please sir alakh sir ko schools kholne ka idea zaroor dijiye Aur pune mein khaskar kholna near Hadapsar

[@kingofkaimur]

Thanks for better understanding 6:55 Best teacher of world Of physics

[@kingofkaimur]

Sahi baat

[@khushiverma2818]

8:37 yes sir Air mein bhi gravity because air mein small particles hote h unme bhi Mass hota h issiliye Air mein bhi gravity hoti h 😊😊

[@rudrachauhan3497]

𝙋𝙡𝙚𝙖𝙨𝙚 𝙨𝙪𝙗𝙨𝙘𝙧𝙞𝙗𝙚 𝙢𝙚

[@WhisperingShorts9695]

Grt lecture sir... 👍🏻👍🏻 THANK U SIR

[@ManishaBanerjee-ok8vd]

H.w. F becomes twice F becomes 1/4of previous value and 1/9 of the previous value F become 4 times

[@Jestom_official_7]

Sir your teaching method is very nice ☺️ thanks 👍👌🥰 sir 🎉

[@bharatmeena2481]

Challenger questions answer---- 1.a) force will be double from actual force. b)in 1st case force will be 1/4 of actual force and in 2nd case force will be 1/9 of actual force c)force will be 4 times larger than actual force. Thanking you

[@jayeshbansal6718]

Challenger question answers:- 1) Force will become 2 times of initial force. 2) when the distance b/w two objects is doubled than force will become 1/4th of its initial value and when it is tripled it will become 1/9th of its initial value. 3) force will become 4times when masses of both the objects are doubled. & Air also has gravity because it has mass.

[@piyushsrivastava4731]

I know that there is mass in the air too

[@bhumingoyal8912]

Apple did not fall on Newton's head it was just observed by him falling Rakshak Sir Op 🔥🔥🔥🔥🔥

[@Cora15500]

According to the laws of gravitational, F= G Mm/r² Where, M and m are the masses of the object, r= distance between both masses. 2. Force is directly proportional to the product of masses. 3. On increasing the mass of one body the gravitational force of attraction will also increase proportionally. Hence, if the mass of one object is doubled then the force between them also gets doubled. Q2) if the distance between the bodies is doubled, the gravitational force of attraction becomes one-fourth. Q3)According to the laws of gravitational, F= GxMm/r² Where, M and mare the masses of the object, r= distance between both masses. 2. Force is directly proportional to the product of masses. 3. On increasing the mass of one body the gravitational force of attraction will also increase proportionally. Hence, if the mass of one object is doubled then the force between them also gets doubled.

[@kavitachoudhary1112]

8:45 Yes sir As you told that mass is required and air has negligible mass

[@raghavtyagiedits3515]

Noo

[@shivvijaysingh2948]

No .. Because air is considered as matter .... So air have occupies space and also have mass

[@utkarshmishra007]

Best teaching ever I had seen ; before some months when I hadn't found this channel I was very weak in physics but now I had got full marks in physics due to PHYSICS WALLAH platform ...A very special thanks to ALAKH SIR and PHYSICS WALLAH TEAM •••.

[@pranavpratik.]

*🧐DOUBT⁉️⬇️* As the universal law of gravitation says that it directly depends on the masses it implies that a man of mass 60 kg will get more attracted towards earth than a boy of mass 25 kg ? (Answer If You Know)⬇️

[@buttyasin8]

Rakshak sir OPIPOPOPOPPOPOP

[@MrAtif-sk1hj]

​@@pranavpratik. Both will be attracted toward the earth at the same speed as their air resistance present on the earth so it cannot be possible on the earth but if we make a vacuum then we can prove this experiment.

[@kavitasingh8909]

@@pranavpratik. both will be attracted with different speeds heavier man will be attracted faster compared to the lighter man....but in case of vacuum , law of gravitation won't apply, so the speed will be same for both the heavy and the light man

[@kavitasingh8909]

@@MrAtif-sk1hj sorry check your answer on earth air resistance is different at different places depending on relief features, air molecules, water molecules, clouds, density and other particles such as dust particles !!

[@thebrighthistoryofdkg4325]

Fantastic class. I am a teacher of history but I realise this topic fluently.

[@mahirathor9485]

Ans (i)the force between two objects will be doubled. (ii)the force between two objects will become 1/4th and 1/9th of the present force. (iii) the force between two objects will become four times the present force

[@devanshgoel7622]

Best Science teacher in online platform

[@screen-marvel-us1424]

The moment when sir gives us extra knowledge which i love to have and then says kher chodo bade level ki bate hai and then leave that topic which i was actually able to learn pisses me off sir dont underestimate us

[@AnimeGirl20.07]

Some children might get confused so thatswhy he do so

[@gooddeedy3984]

Fukkri Mt maar 🤯🤯🙄 Sir tumko underestimate kyu krenge but instead u people underestimate him 🤯 jitni knowledge di h utni rkho

[@irajkumaryt8334]

Yes air has gravity because it contains small particles or small dust particles which has small or has very small mass which is negligible

[@AdityaChandel-o1q]

Challenger question Q1 Ans. F'=2F Q2 Ans. (a) F'=F/4 (b)F'=F/9 Q3 Ans. F'=4F Thanku so much sir ji ❤❤❤

[@krishnakaushal8834]

Answer of challenger questions. 1. F' = 2F. 2. F'= 1/4 F. F' = 1/9 F. 3. F' = 4F.

[@maxsingamerofficial]

8:36 Because air has mass, Earth’s gravity attracts it and gives it weight. Because it has weight, and the air molecules are constantly bumping into things, it exerts pressure.

[@mukeshchandmeena1103]

Aap mahan ho baba

[@PremSagar6527]

Kepler's law padha diziye sir

[@fffcriteria4902]

Thank you soo much Before I got 2/8 in my first exam Now I got 7/8 in my second exam Thank you soooo much !!

[@ShivamSharma-yd5tk]

According to the universal law of gravitation the force of attraction between two body is directly proportional to their mass and inversely proportional to their distance between them ❤️❤️( it's my language)🙄

[@demonsking7851]

Square or product Tera fufa likhe ga 😂

[@aizenff009]

@@demonsking7851 Abe Tu hi likh de na kya bata raha esko apne baap ko

[@KisLayz]

3:06 sir mujhe to lagta hai nhi gira hoga ... Bas Newton ne diya hoga gravity ka ... Kyuki agar sach me girta to vo gravity ke bare me nhi sochta seb uthata khata aur ghar ja ke so jata ....😂

[@hitmanop5678]

Lmao

[@NishaSharma-yc8wv]

44:00 (1) the force becomes 2 times when the mass of one object is doubled (2)the force becomes one-forth times when the distance between doubled and the force becomes one - ninth times when distance between object is tripled. (3) the force becomes 4 times when the mass of both object is doubled. 😊

[@sufferesthumanbeing1926]

The second is tricky

[@NishaSharma-yc8wv]

@@sufferesthumanbeing1926 no it is not tricky you can also learn the 2 answer in another way that is the force becomes 4 times less when distance between both of object will double

[@NishaSharma-yc8wv]

And the force become 9 times less when the distance between the objects will tripled

[@sufferesthumanbeing1926]

Ok

[@specialcamera5918]

i=the force will increase. ii=the force will be decrease by 5 times. iii=the force will increse by two times. 44:02

[@binarymastermanofficial]

One more question How can the heart be strong enough to pump blood up your legs against gravity?

[@DARK-0007]

Because of the valves, the blood can only move in one direction as it gets squeezed along. So it is a combination of blood pressure from the heart's pumping action, the valves, and muscle movement that gets the blood up the legs against gravity.

[@santoshsinghkushwaha8122]

@@DARK-0007 yep bro right....

[@talentsclub9765]

Your are best teacher and I love yr teacher style👍

[@Osamudazai07]

since air contains some mass/some volume so we can consider that air also HAVE some gravitational force in it , but since its mass is really light and small , its gravitational force wont to be powerful enough, thAnks for the video sir

[@veergurjar9669]

Kya haal h

[@arunphogat9104]

Hiiiiiiii🙋🙋🙋🙋🙋🙋

[@Im_ritikpal302]

I like the teacher as you explain in hindi ...... study know English very well but still we catch concept more readily while learning in hindi ... that's why l like This foundation more than Bhedan ❤❤❤❤❤❤😮😮😮

[@nishant_verma4696]

ati sundar sir jee ; ; ; ;; thanks for pw

[@IshitaVijayvargiya]

sir your teaching is so good but sometimes we watch your videos to learn how to simplify bigger digits(the last part of every question). it would be so helpful if you will simplify it too.

[@vasundhragupta4003]

Thank you very very very very very very very very very much❤ sir. Guru ji apke jesa teacher 👩‍🏫‍ agar sabko mil jaye toh sab scientist 👨‍🔬 ban jaye ga 24:35 🎉🎉🎉🎉❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤❤Physics is easy 😎❤❤❤❤❤🎉🎉🎉🎉🎉🎉

[@amreenbano4973]

Sir after seeing your video physics became my favorite subject 😊😊. THANK YOU SO MUCH

[@mukundkumarsingh4222]

Sachme....waah..!!

[@harbeersingh2364]

I think this lesson is so hard, but I see your vidio my mind is changed now, I am thik this chapter is so interesting. 📚🤗

[@Kvlogs_1]

8:54 yes sir air has gravity Because air has mass, Earth's gravity attracts it and gives it weight.

[@ff.tanmoy1728]

Yes

[@neelamravi7333]

What a great lecture !!! . Thanks sir ji for this great lecture 🔥🔥🔥🔥🔥

[@stgamer2531]

You are great sir ur teaching style attract me always👑👑 , sir we need again a new batch for class 9. Like a sprint batch ... .. 😊🙌🙏🙏

[@chandajaiph3886]

Write

[@puneetarani8354]

Yaa❤❤

[@Princekumar-lz7cp]

Rakshak sir is the best physics teacher.🙏🙏🙏👍👍

[@Prawez746]

Kas hamare school me bhi aap jaise teacher hote to padhne me maja hi kuchh alag rahta

[@Achovlogss]

If mass of one object is doubled force will become double F=GMm R² F=G(2M)m r² F=2GMm r² =2F ii) if distance is double small r becomes 2r F=GMm (2r)² F= GMm 4r² F=1 GMm r² F=¼F iii) if distance is triplet r becomes 3r F=GMm (3r)² F= GMm 9r² F= 1/9 GMm r² F=1/9 F m¹=2m m²=2m² F= G(2m) (2m) r² F=45 Phewwwww