Gravitation 04 | NCERT Numerical Practice Session | Class 9 | NCERT | Sprint
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- Опубликовано: 10 окт 2024
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🗓️ Scheduled Syllabus For Sprint ( Class 9th ) released describing which topics will be taught for how many days.
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•Duration:-1 month (Jan 2021 - Feb 2021)
🎉 Free Batch Exclusive on our RUclips 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
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❤️ Padhai Karte Rahe, All The Very Best 👍
Thankyou sir 😊😍
Sukriya
Sir naye batch ke liye new video banaiye
Thanks sir mujhe sare numericals to aate hai par sir mai bahut confuse hoti hu ki g ki value me minus me li jayegi ya phir + ki
15:51 sir 16.333333333 ans
5:34 Sir g will be positive if. the object is stationary or moving downwards. g will be negative if the object is moving upwards.
purane lectures dhyaan se dekh samajh aa jayega
@@awakinthunder kal exam hai purane vedios dekhne ka time nahi hai please batado kyu hoga aisa
@@awakinthunder aur ho sake toh abhi
@@kanu6894 dekh ek easy way bata rahi hun. In our no. Line if we make it vertical negative no.s were coming down so if it's falling down soo the g will be negative. This isn't the correct explanation and shit but this is a trick of my own
yep, because force is working against gravity but there the car is coming down that's why downward g will be p+
For falling objects, NCERT books states the gravitational acceleration is positive whereas you say that it is negative. It's confusing. Could you please recheck and clarify.
Same problem bro
Same here ...
Same problem here
In lecture 1 or 2 sir said that in bigger classes this positive will be however turned into negative itself that's why he said it otherwise it will cause problem for students in future however it is correct in book at standard 9 but it would be changed in 12th or 11th if u will opt for sci
❤
46:01 Sir is singing a song.
Mai itni sundar hu mai kya kru.
I m like wah sirr moj kra di sirr moj 😀😀😀😀😀😀
Lol 😆🤣😂😹😆🤣😂😹😆🤣😂😹😆🤣😂😹😆🤣😂😹😆🤣😂😹😆🤣😂😹😆🤣
Yeah 😂😂
😜😜🤣🤣🤣🤣
Aise koi na majak mat udao
Rakshak(protection) sir always protects us from failing in physics...😂
Bro
Sir yarrr 3 eq kyun lagai
Rakshak means protector not protection
at first i thought you are talking about other protection ........
Kal kiski kiski exams hai 😂 all the best for tomorrow's exam 😂😂
kal mera exam hai 😂 Thank You...
Mera ! Thankuuu !
Mera😂😜
Thank u .
Mera
15:47
Correct answer is 16.3
Chlo koi to h jo meri trh soch rha h
Yesh
Bhak
I am just wondering that how the gravitational acceleration can be -10 m/s as gravitational force act downwards and the object is also falling downwards.. So the g should be 10 m/s
Because g is along -ive y-axis
Sir has done some mistake.
@MariaMaria-oy5yp
This is not maths this is science
Same doubt 🧐
actually we take the signs - positive or negative , by cartesian plane and in the cartesian plane - for the downward direction we take minus sign as we have learnt in the chapter 3 of maths -coordinate geometry
For falling objects, NCERT book states 'g' is positive where as you say its negative . Could you please check and clarify..
Plz check previous videos of the chapter......your queries will be solved
28:40
Sir net displacement will be zero because final and initial position are same.
And distance= maximum height ×2
=80×2=160m respectively
Not as per the question. It never mentions that the stone comes down again. It just says it reaches a height and then we stop tracking the motion of the object so final position is not the same as initial position. Therefore, net displacement and distance is the same as motion is in a straight line. So all answers are 80 metres.
Hope you got it!😊
@@AryanPanda-pk5jf it's not said but according to gravity it will come down for sure
I understand what you are trying to say, but we must only consider the given data as per the question. But like you said it will eventually come back to the ground. For the sake of the question, we don’t consider it. Just like in math questions, nobody is going to buy 100 oranges, if you understand the meme.
@@AryanPanda-pk5jf but in NCERT books displacement is given as 0 and distance as 160
26:26 Sir, the final velocity should be negative, but it is positive. Why?
Thanks for 4th lecture ❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️❤️
28:40 sir but here total distance= 80+80(ascend+ descend) = 160m
Displacement=0 (because when we throw a stone it get backs to initial position so displacement will be 0.)
@Technoblade rest in peace bro when we throw something it always attracted to earth due to gravity.
@Technoblade rest in peace Are bhai kaihna kya chateh ho
@Technoblade rest in peace Jo tumne kaha 🤭🤭
Right
Total distance will still be 80m, not 160, since the body hasn't come to ground yet. Take Hmax to be distance covered, Hmax= u^2/2g , direct formula, if thrown at an angle then multipy u^2/2g into sin^2theta.
44:50
Sir maine a = 9.8 Liya tha to mera
U= 29.4 m/s
S= 44.1m/s
Position =39.2 m
Aaya hai to kya yah sahi hai?
Sir in question no 1, when an object is thrown upwards, acceleration due to gravity is negative and when an object falls downwards g is taken positive..?
We always take g =-9.8 because it always acts downwards. as in free fall questions a=g so acceleration becomes -9.8 .
There is nothing like +g
Check previous videos
Any one 2024 😂
Yes
Yes 😂
Ya
Ha bhai😂
Bhai tara sub to bahot ha
😮😮
46:07 he is singing itni sunder hu kya karu😂😂🤣 lit yaar sir app sach mein lit AF ho💥💯😂🤣
🤣🤣
Yes 😂😂
Sir distance =upward height +downward height that is 80+80 =160. and displacement =0 because initial and final point are same
Same doubt
Me too
Yeh galat kar hai upar ke liye bhi - and niche ke liye bhi -
Sir in Q3 the mass of moon will be 16.3 Newtons, not 16.6 Newtons
You are right team pw
You are right
My son
Abe tum sab galat ho
Are Uloooho 🦉
Answer 16.2 N hoga na ki 16.3 N
💢
It can be both values depend upon that u choose g = 9.8 or 10 m/s^2
28:43 sir total distance will be 160 na because it have asked total distance covered by stone if the stone will go 80m up then it will come down also 80 m and the net displacement will be 0
Yup.sir is wrong here .so
It's simple net displacement is 0 because stone reveredy to is actual position and total distance covered = 80 +80 =100 m
In question it is not given that the stone come to the ground
@@sibasishpurohit brother if it will go up then its fact it will come down even
@@sibasishpurohit bhai gravity name ka bhi koi chiz hota hai 😂😂😂
vaise ncert book me bhi back page me answer diya hua hai dekh lo
Chapter 10, question no. 15
@@shubham7009 80 +80 =160 not 100
Shayad tumne galti se 100 likh diya 😅
28:53 best part 😄😄😄😄😄
28:45 sir actually total distance will be 160 meters because it is also asking the distance to up +distance down
Then the displacement will be 0 bro...!!
@Snehal Gaming YT Hnnnn😜
no then displacement would become 0 the question just said that it went not that it came down so distance would be 80 only
u=√20h dhalo answer mil jayega
We know that u=40ms-¹ and we don't know displacement hence apply u=√20h then, 40=√20h, square both sides to remove root then (40)²=(√20h)² now 20h=1600 h= 80m if you like my solution pray 🙏 for sir Issac Newton RIP
P- phosphorus
H- hydrogen
Y- Yttrium
S- sulphure
I- iodine
C-Carbon
S-. Sodium
C- Carbon
H - Hudry
E -
M-
I - iodine
S- sulphur
T -
R-
Y-
Wow 😂😂
Chemistry in physics
@@roushanraj876 C
C- carbon
H- hydrogen
E-=mc^2
M- Molecul
I- iodine
S- sulphure
T-titanium
R- Rutherfordium
Y- Yttrium
Physics wallah will die after seeing this😂
Sir i got full marks in my physics UNIT TEST and i only study from you i dont have a tution or any coaching bus sub aapki kripa hai, THANK YOU!
😇😇😇😇
28:45 The maximum height attained by stone is 80 m. The total distance traveled and displacement of the stone after reaching the ground is 160 m and 0 respectively.
I feel the same.
Yes
No bro kyuki sirf pusha tha ki stone ne kitna distance cover kiya . Ye to likha hi nhi tha ki stone return to the ground .
@@MRGENIUS22 haan i agree
@@MRGENIUS22 total distance covered pucha tha
32:47 legends have noticed this😏😏
Sch me kya bhaukal hai physics wallah ka
Loved it a lot ,❤️❤️❤️❤️😍😍😍
Uses insta..?
When an object is thrown upward direction it is negative when it is thrown down it is positive
Yes. Sir told wrong in 1st question
Yess
exactly
Sir ke purane lecture fir se dekho
Yes brother
brilliant explanation, evrywords are understandbale , THANK YOU SIR FOR MAKING PHYSICS A FUN
Your words no understanbale
@@Vivek12890 apana kam khud karne ka😂
46:07 it was hilarious 😂😂😂
It was a nice lecture it really help me a lot thanku sir
Sir I don't know physics but ..I think in free fall when the car is falling towards downwards direction then we will take g as + ve bcz it's moving under gravity
Yeah...mujhe bhi isme hi doubt h
ha BHAI I WAS FOUNDING THIS COMMENT
Bro it would be negative according to the Cartesian plane. Either positive or negative, it is correct though.
na bro deko hamesa direction of vector quantity cartesian plan ke hisab se lo fir kabi galat nhi honga
5:50 Sir, *g* taken as positive when objects goes downwards. Because Object Is Displacing in the same direction where Force Was Taking Place.
Sir we take value of g + when it fall vertically downward and we take value of g - when a object vertically upward
Yes bro
actually we take the signs - positive or negative , by cartesian plane and in the cartesian plane - for the downward direction we take minus sign as we have learnt in the chapter 3 of maths -coordinate geometry
Sir for last question it should not be √132 / 10 👎. Sir it should be √134 /10 . You are my best best best physics teacher ☺️
Thank you sir for your determination to do so much for us
Rakshak sir Op 🔥🔥🔥
No words for this type of amazing explanation ❤❤❤
What a legendary teacher Rakshak sir is !!! ❤❤❤
15:56 sir (g= -10) then the answer would be in positive (-100) because the force is downwards and acceleration should be taken negative?
All the best legends for tomorrow exam's 👍🥲🥹
yep
Sir aap bahut accha padhate ho you are best teacher.
THOSE WHO AGREE PLEASE LIKE...❤❤❤🎉🎉🎉
Sir, if an object is stationary or moving downwards the gravitational acceleration will be positive...
And if an object is moving in upward direction the gravitational acceleration will be negative....
28:54 op🤣🤣🤣just died because of laughing, and then took birth again to complete this video.lmao 😂😍
Kamedy!
37:34 sir is standing on a platform near the board. Whoever who observed next to me should be a legend 😆😆😆
38:30 pe sir jo figure banaye hain uske bare me aap bat kar rhe hain kya🤔😏
Me,
@@kumar.a.v3095 sir platform se utre the
Can anybody help me?
At 37:10 , Sir found out the speed which was 4s. However, it's given it takes a second to cover 25s and height is 100 m. Than you can find it easily by doing 100/25 = 4s.Than, why sir told a big method.
@@lakshaygupta8496 bhai ya to english Improve krni pdegi tumko
Ya to tumhara concept haga hua hai..
It's given the stone is projected upwards with an initial velocity(u) =25m/s
Not That the stone takes 25 seconds to Do the Motion..
Hope you understood.
And speed can never be in seconds
It is always In Seconds
U have written in ur comment that speed=4s.
Try to improve your concept understanding and practice.
Just a friendly advice.
Sir but thoda confusing ho gya ki kaha pr (9.8) or kahan pr (10)?
Yes it's so confusing 😞😞
sir the net displacement is 0 because the stone will come back to the initial point, and the distance will be 80 multiply by 2 which is 160.
My answer is also same
Sir mera ek doubt hai ki jab ham weight find out krte hai , tab 'g' ko 10 m/s² kyu lete hai , -10 m/s² kyu nhi lete.
Sir in ques.7 total distance covered by the stone will be 160m ....as it returns to the ground also.
Yes I also want to say that only
Yes s=160m
@@Vilayamyadavneet no because , in the question it is not mentioned that the stone is falling down again
Sir in question 3 answer of weight of moon will be 16.33333........
16.67N
Sir you are my favourite teacher on RUclips ❤️
You are the best teacher in the world thank you very much sir you explain very well
if it falls downwards, won't it be positive?? Because gravity is towards the ground and i have already been following this phenomenon only even it's written in +ve in the book too, pls clear my doubt.
actually we take the signs - positive or negative , by cartesian plane and in the cartesian plane - for the downward direction we take minus sign as we have learnt in the chapter 3 of maths -coordinate geometry
please tell me if it was helpful for you
Sir right now for the practice we can take the value of g10 inthat moon and Earth que.
I am attempting your lecture first time and really I understand this chapter very clearly 😊😊👌 really an amazing lecture thank you very much
First of all this is last lecture
@@ultrasong8284 I know I need only numerical
*attempting*
@@drawiteasy4458 bhai 6 class kids attending 9 class lectures and they dont know english lol
you make my physics easy rakhsak sir and whole team of physics wallah thank you so much 👍👍❤❤
28:36 sir net displacement will be 0 m
28:52 so epic 😝😂😂🤣
52:00 sir it should be 6.7 only instead of 6.6..and sir for me the answer is under root 13.4
Yeah me too ..... At first I thought I was going wrong :P
@@Sunshine9p ❤️❤️
28:36 sir but total distance should be 160m bcz sir if stone goes up then it also comes to the earth surface...therefore the total distance should be 80 + 80 :- 160m
true
Are bro question me ye kaha bola hai ki stone wapas ground pe aaya hai..
Agr stone wapas ground pe aata tb distance 80m + 80m = 160m hota.
Read question clearly
Arrey bhai question mein likha hain find the total distance matlab 80+80=160m
@@rajivks7966 ha total distance likha h but ye kaha likha h ki "Stone returns to ground"
Thoda socho bhai.
Question aise hi hote h confused krne ke liye.
@@vikasjaiswal5473 bro are you serious total mtlb upper se niche ana tak hota hai aur object return ayega kyu nahi uski inti velocity nahi hai ki woh troposphere ko bhi cross karle
sir your teaching style is different from other teachers who taught me.
now my physics is good enough only by you RAKSHAK SIR
🙂🙂
Voh sab toh thik hai bhai pr tu yeh fake emoji kyu bhej rha hai ??
Sir doubt Ta ki object displace ho raha hai to positive Hoga Kyunki Upar ki taraf Hota To negative
Sir g will be -10 when object is Thrown upward and when coming down it will be 10
Sir i think that in question no 7 the total distance is 160 m and displacement is 0
28:43 displacement =0 and total distance =160
Yes right
@Technoblade rest in peace how wrong???
23:44 sir Mera time 9.8sec Aya tha kyuki Maine -10m/s acceleration due to gravity liya tha . ❤❤
Sir ek cheez me doubt hai muje aapne first question me g ki value negative q li??jb object neeche aa Raha hai toh gravity k along hai fir sign negative q liya
Sir, but agar koi bhi object neeche ki taraf jati hai to calculation to +g se hota hai na.. kyuki wo gravity ko oppose nhi kar rha.. aur agar koi object uper ki or jata hai gravity ko oppose krte hue to fir usko -g mante hai..?
answer krdo koi🥲
Q3. the weight of an object on moon having mass of 10 kg is 16.33N but, why have we not taken it negative ?👇🏻
[ it should be -16.33N ]
Don't fear😱 when physics wallah is here 👍👍
School wali madam be like:Sir aapko mujhse problem kya hai 😂😂😂
13:46 Sir the answer should be 14 m because if acceleration is not mentioned 10 m/s in the question so we have to take the acceleration 9.8m/s(gravitational force) so the answer would be 14 😊😊
28:42 net displacement 0
td 160m
yes
This is my fixed tchr to study pyschis 💎
Tu pahale English seekh
Sir in 8th question for both cases why you took acceleration as -10
actually we take the signs - positive or negative , by cartesian plane and in the cartesian plane - for the downward direction we take minus sign as we have learnt in the chapter 3 of maths -coordinate geometry
😂😂Kal Jiski Jiski bhi exam ho😂😂, aap sabhi ko {BEST OF LUCK} for tomorrow's exam
Thanks bhai💕😂
44:54
Q.9 (iii) ans. should be near to 4.9m (bcz I have taken g = 9.8m/s²)
Because after 4s time will be 1s and u=0m/s
Wo top se distance hai sir ka bottom se se distance hai
44.1-4.9 kar de 39.4 near to 40
28:40 after the calculation we get, Total height reached by the particle = 80m. Hence, Dist = 80*2 = 160m and the net disp will be 0 becsuse stone returned to the initial point of the action. So, highlight this comment to avoid such mistakes like this.
Thank you so much sir aapke uja se mere exam bhaut achha Gaya 🥰
Sir, when the object is falling downwards g is taken in positive and when object is moving upwards g is negative
Lol go n watch the last lecture carefully than u will understand
@@mr.batman384 ur wrong bro just watch lectures of other teachers or in school
@@streamermodeguy6109 hey idiot when u will go in 11th class than u will just find it bro try to be over smart without knowing anything sir is just teaching for some advancement in us
If We Take -9.8 m/s^2 In Newton's Equation of Motion And acceleration due to Gravity is Always Negative Then Why we Can't Take -9.8 While Finding weight . I want Answer Please Tell me Sir Please 😥
Same question here 😟
@@dakshsrivastava6722 oh hello i am also daksh and kaiyasth😂
@@dakshsaxena4298 haha Same 😂
Because the weight's formula is W=mg in which gravitation constant should me either 9.8 or 10 as per as the situation of the question.....
I hope it had helped u🙂
You are correct
I am also 😕 confused in this question
In qno.7 displacement is zero beacuse the stone will come back to their initial point and the total distance covered be 80+80 = 160 metre
sir, in the first question g should be +10 not -10 because its falling downward
PLEASE reply
Can someone explain:
Sir took gravity in negetive when the object goes down in the first sum and at 28:53 he took the gravity as negative when the object was goin upward so when should we take gravity in positive
Kyuki sir ne iske phele vale lecture 3 me bataya tha ki gravity downwards direction me lagti hai . Sir 11 class ke hisab se bata rhe hai upwards or downwards dono directions me gravity ko negative he Lena hai
When you take on cartesian plain downward X axis means negative (-)
@@crickvk1856 downwards is y-axis.yes it will be negative
Sir can we use Sn formula for taking out the displacement after 4 sec?!
Maybe it's wrong
No at 4th sec
Sir , in 7th numerical you have told net displacement is same as distance that is 80m but displacement should be 0m bcz stone returns to its final position
Yes same here
g should be taken in positive when body is falling in downward direction
Yes
28:48 distance is 160m hoga
28:40 Can anybody pls tell me why in Q7. Net displacement is 80m? Because when the stone is thrown up and again reaches the ground, it should be zero(Initial and final positions are same). And total distance should be 80×2 = 160.
Displacement should be 0
@@Mdmon19 Yeah, in our school, our Physics teacher said displacement should be 0
It's correct in each way
But in the question it is not written that the stone returns so displacement will be 80
Sir in question number 6 why the value of final velocity (v) is positive according to your sign convention it's value is negative since it is also a vector quantity and direction is downward
After solving equation in which you have put -a and -s your answer become atuomaticaly +v
Raksakh sir talent is infinite. 👍👍👍👍
Op
Limited
Kal jiska jiska exam sabko mere taraf se all the best👍👍
10:37 sir why'd you not take distance as negative from the earlier equation
Sir , plzz make work and energy CHAP tomorrow is my exam
Thnx lecture fourth ❤️👍🏻👍🏻👍🏻👍🏻
I wish if you were in my school today I would be far ahead in physics
Acha online se hi ho jao offline nhi toh online hi shi bta abhi toh 10th me honge😜😂
@@Anaya-Bhardwaj6095 ap kon?
Rakshak sir is the all mighty and the best of physics.
Who thinks he is?
28:40
Distance= 80m
Displacement=0m
Total distance= 80+80
= 160m
Thanks, if this help u please like
Please 🥺🥺🥺🥺🥺
Its wrong .. in the question it is not mentioned that stone is returning back
@@GamingPro-ly9mg Abe saale jab stone upar jayega toh return nahi hoga kya pagal😐😆
Bhagwan sabh ko pass kra :)🙏
Bhagwan nhi teacher sabko pass Karen😂😂
sir isn't the first formula : M1 x M2/ d2?
F=G M₁ × M₂/d²
Sir i have a doubt, in the first question why did we not use s= ut+1/2at2?
Dono use kr sakte hai 😈
Kyuki isme jyada solve karna padta
@@arpitsinghthakur55001 wow blud, im about to write my next year final exam. Real helpful
Why cant we do 9th question like this:- v=u+at [ time takes to go nd coming of the object is 6 sec so each time it travel is 3sec ]
0=10(3)+u
= u = 30 m/s