118 Replies
@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.. . . .
bro why u trying to make me feel phy dumb
more
š
;-;
me feel same
;-;
abhi general me bolke gaya tha
ki maja aa raha WPE karne me
phir ye koschen aa gaya
Aukaat dikha di šæ
ikr
maine dekha
com se bahut se hoga ye š„°
aayein
leave COM
Momenta conservation ke baad work-energy theorem ig.
hmmmmmmmmmmmmmmmmmmmmmmmmmm
friction ka main task is toh stop relative motion
yup dono same speed se chalenge you can conserve momentum to find the speed
ah ok
mai yahi puchne wala tha
ki same speed tak leke jaana or not
first time encountering sch koschen
infinite time hai
from this point
we can say ki
until
han if you use COM then no need of momentum conservation
it stops
completely
rigjht??
why stops?
friction
will make it stop?
the small block
friction bhiya haina yaha
opposite force
friction ka main task is toh stop relative motion
kiske bich ka?
agar dono ki relative velocity zero ho rahi ho toh friction ko koi samasya hai kya?
blocks
but wont it also make the block stop all together??
2nd block ko toh friction aage bhej rha hai
to usi se to motion ruk gya na
haa to wahi na ki block sotp ho jaaye š
dekho
dikhao
friction 3m pe aage kyu laga?
taaki relative motion jaldi stop ho jaye
friction ye nahi chahta hi dono ruk jaye
friction ye chahta hai ki ek ki frame me dusra ruk jaye
hain matlb
kuch smaj nhi aya
friction is only between the blocks
thoda diagram se batao na
yea meant that only
not between surface and block
hn tht ik
friction ka main goal is to stop relative motion completely
block aur block ke bich ka right?
ab m mass ka block hai wo v se chal rha?
yes
toh friction ki wajeh se m mass ki speed kam hogi and 3m ki badhegi ryt?
agr uspe friction lagega uske baad to nhi na ik point pe vo stop ho jayega
hn
stop with respect to ground or with respect to 3m?
wrt 3m
toh ek aisa point bhi aayega jab dono ki speed same ho jaye?
hn
ab agar dono ki speed same hai toh friction ko koi takleef?
nhi
bas toh friction lagna band
ab no force in horizontal direction
yuss
toh infinitrly ye aise chalenge
to us point pe dono ki jaha same hogi vaha f kaam nhi karega
Precisely.
yes uske baad se nahi agar koi external force nahi hai toh
to humko us point tak karne wala work done chiye
okk
yus
us point ke baad kuch bhi karlo sab same hoga
easy to find now ho gaya poora
wait
ohkk
(u can solve this usingg COM in 1 line)
....
UHM
kaise
COM ko rest pe leke??
nahi why would v com be zero
dono ke combined COM ko
idk why v aaya just COM
dekho do you know the formula for kinetic energy in COM frame?
are mere liye bhri hora mai chli
bhai abhi COM revise ni kara hai š
nahi
khana banane kuch
lol
mera loading nhi hora
khana banane se NEET nahi nikalta šæ
khana nhu khaya mai nikal jaungi
Valid.
byee.
mujhe dm me que explain kar dena baad me
sure
COM se how
to du
$\frac{1}{2}M{v{com}}^2 + \frac{1}{2}\mu {v{rel}}^2$
Aetherfly
Compile Error! Click the :errors: reaction for more information.
(You may edit your message to recompile.)
:kheer: yelo adv me khir
ty
ye formula pta hai kya?
Adv me khir nahi 60% marks chahiye š¤¤
ye to na pta tha
aeee
yaad ni aara
han neet walo ko nahi padhate honge
COM not revise
but yea
sad
bye.me goo
amigos
good
bye
haa ye
kaise hoga
kya hai ye
explain plij
is u here
reduced mass?
kinetic energy in COM frame
yes
ohhhhhh haa ye aata hai
reduced mass
notes me hai
NOICE
got it
padha hai bas revise ni kara to out of mind
ab karke dekho isse no need for momentum
yeah happens
i think
maine kuch
galat kara
ek baari aap solve karke bhej denge please š
using the COM
Mom. conservation aur WET se ho gaya but multiple methods OP
ok
oh shit
ye toh ek line ka bhi nahi tha š
v_com toh constant hai lol
zeero seconds me ans
bhej to djiye š
raaste me hai
I love this formula so much
@flower V com is constant cuz no external force : )
kheer khane chale gye kyaa š
Answer is -15mv2 / 32
Bike chalane ššš
Ah trippy question. The question asks work done on the block only. So, final velocity of the block is v/4 (Momenta skibidi) and the change in energy of the block is 1/2m(v^2/16)=1/2mv^2=-15/32mv^2
sed
you cpuld still do it
i dont get it
From momenta conservation, we have m.v=4mv' meaning v'=0.25v. Now change in energy of block is w.d. by friction, so 1/2mv^2(1/16-1)=-15/32mv^2
Haa wo to hua
But from COM
Answer alag aa raha inka
Can you share the method?
Also we got Lance saying Skibidi before GTA6
This
..
Merko to nahi ata tha he said ki ho sakta I asked how plij show and now he getting diffrent answer
That is the work done by friction on the system however ig.
yup
the qn asks work done by friction on the block
not on the system
So it include work done by friction on small and big block?
yes
Yep.
Sooooo COM se block ka aise nahi niklega?
hmm lemmi think
friction is constant
nikal sakte hai I guess
but momentum conservation wala short padega is case me
phir hame dono par friction ke work ko relate karna padega
I see I see
Theek hai thsn
Ig it's sorted
Tha ks ji
ok ji
+solved @Aetherfly @SirLancelotDuLac
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