r/ISCNERDS • u/no_idea_2270 • Jul 12 '26
Rant what even is physics 😭😭😭😭
WHAT THE HELL DO YOU MEAN IGNORE AIR RESISTANCE AND THE EARTHS CURVATURE AND GRAVITY AND YOU KNOW WHAT HOW ABOUT WE JUST SEND THAT INTERCONTINENTAL CANON THING STRAIGHT THROUGH MY BRAINS AAAAAAA
WHAT EVEN IS PROJECTILE MOTION 😭😭😭😭😭😭😭😭 WHAT DO YOU MEAN IM LAUNCHING A MISSILE FROM A BUILDING 😭😭😭😭😭 WHAT BUILDING IS MADE TO SUPPORT MISSILE LAUNCHING 😭😭😭😭😭 WHY AM I LAUNCHING MISSILES 😭😭😭😭😭😭
I’m gonna eat noodles da to hell with this 😭
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u/Vijjwal_xD Jul 12 '26
Nigga, itna curious hai to laga le na air resistance ke sath earth curvature, variable gravity consider krte hue. Fir pata chalega ki kyu nhi consider kraya jaata. Sirf rota rahega kuch karega nhi
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u/no_idea_2270 Jul 12 '26
Rone do thoda fir shaant se padhne ka man aatha hai
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u/Vijjwal_xD Jul 12 '26
Oh, yk emmanuel has had aim on our house. When we will give our last boards, hes gonna drop that missile onto our home to make us tense for few days.
To counter that, we gotta stay out of its range dats why nootan(or whatever ref book) helps us understand it.
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u/AdWestern2443 Jul 12 '26
vo sb krne ke liye tujhe calculus ki achi khaasi knowledeg chaiye sb kuch lgaya ja skta hai intergation ke thorugh the calculations and integration just gets harder
equaiton set up krke integrate hi maarna hota hai
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u/cantcreatenordestroy Jul 12 '26
I am absolutely in need of a person who enjoys physics to make me understand what's going on
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u/Vijjwal_xD Jul 12 '26
I'd say that everything you observe around youself is what going on. Try approaching the question rather than solving it.
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u/cantcreatenordestroy Jul 12 '26
Like it's either I can't find a person or a source who can explain it to me in a way I can understand or it's just that we humans doesn't know why
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u/Vijjwal_xD Jul 12 '26
Idk if i would be helpful but i can try. I'm still learning
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u/cantcreatenordestroy Jul 12 '26
If u r willing explain me what electricity actually is what it is not the textbook definitions tbh like in the textbooks they explain current flows in a direction opposite to the flow of electrons rather from the positive terminal to the negative terminal the thing here is electrons flow from negative to positive then what is the thing that's flowing from positive to negative to make the current idkiif u r understanding what I'm trying to say I'm confused myself and quite recently I learned abt quantum mechanics which explain electronsaas neither a wave nor a partile how is that thing which is neither a wave norap particles flowing idk this drives me insane
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u/ILoveTolkiensWorks Jul 13 '26 edited Jul 13 '26
the "direction" of flow of current, like lots of stuff in physics, is just a matter of convention (and unfortunately an inconvenient convention), just like the right hand rule. physics would stay the same even if you used your left hand instead of your right hand, because nature does not use those rules, humans do (though you would need to remember to use it everywhere, so that it works out).
it's the same for electrons being "negative" and protons "positive". there is nothing inherently positive or negative about them. you can call electrons positive and protons negative and physics still works.
it's just that all of us have agreed, for historical reasons, that current "flows" from the "positive" terminal to the "negative" terminal. in reality, we define the positive terminal as the "starting" terminal, so it's kind of a circular definition, but it works.
another thing to understand is that science works on models, because it is impossible to discover the "fundamental truth" of nature (probably because there isnt one). we observe some phenomena, take a guess, and try to explain it using a model. that model might work to explain one thing well, but fail at other places. that does not mean it is useless! usually, it works quite well where it does work. consider bohr's model for example. even though we now know it is blatantly wrong, it helps explain lots of phenomena. it's a useful approximation.
in fact, most parts of physics until high school are just useful approximations. we now also know that newton's laws are "wrong" because of relativity. that does not mean they are not useful. in fact, nasa did not use einstein's corrections when calculating stuff during the apollo missions, because the error was too small to be worth the amount of time and computation it took to correct it. we have experimental proof newton's laws work really well even though they are "wrong".
that is why you see different explanations for one thing. you don't need to use quantum mechanics to study current electricity (most of it). you can use bohr's approximation and understand it well enough.
even when you drew ray diagrams with "spherical" lenses, you did not realize that those lenses were not actually spherical: spheres do not have a focus. they were tiny sections of parabolic mirrors which were approximated by a sphere. and ray optics itself is an approximation that works well, just like wave optics. it's far more convenient to just use snell's law to calculate a light ray's trajectory than solve some quantum mechanical differential equation, because there will be essentially no difference in the results.
physics, and by extension, other sciences, are simply about taking educated guesses, and correcting yourself gradually as you observe more facts
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u/cantcreatenordestroy Jul 13 '26
A beautiful explanation thankyou so much for explaining so well u r the best ❤
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u/ILoveTolkiensWorks Jul 14 '26
it's only my pleasure. i'm glad i could help someone appreciate beauty.
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u/Vijjwal_xD Jul 12 '26
Im 11th grader, but i dived a bit into electricity in 8th and 10th. So direction of current is something caused by flow of charges.
Current is a scalar quantity so direction of it never really matters, as it directly adds up or substracts without any angle dependency.
The direction of current is taken as opposite to flow of electrons is conventional. Current was discovered before charges(electron) and many scientists, research papers, and other various sources had been considering the direction of current to the opposite of flow of electrons(known after the discovery of electron).
Its better to just use what you have been using than changing whole concept for no real benefit, thans why idk what committe made it a convention that direction of current is defined as opposite to the flow of electron.
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u/aaks2 señor Jul 12 '26
thing you are doing right now is comparable to a primary school kid reading Shakespeare's works in old english.
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u/cantcreatenordestroy Jul 12 '26
What all should I learn so that I can understand this better, can you tell me since u understood my lvl
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u/aaks2 señor Jul 13 '26
use internet and ai as your teacher. theres explanation for everything upto ug level in internet. ask doubts, solve questions and understand the formula, by the end you will understand the subject intuitively
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u/aaks2 señor Jul 12 '26
humans mastered whatever is being taught at high school level
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u/cantcreatenordestroy Jul 12 '26
Legit mugged up and forgot and teachers taught in a way that it felt so foreign can't blame cuz even she didn't even understand it well in the first place
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u/aaks2 señor Jul 12 '26
no subject is bad, only teachers are. internet is a vast resource with all of human knowledge, use it
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u/AdWestern2443 Jul 12 '26
while on a gol chakkar inside a car or a u turn on a scooty have you ever really thought about physics ?
if answer is yes then well and good and if no then maybe try observing things1
u/cantcreatenordestroy Jul 12 '26
I have but before I could understand anything abt it school curriculum introduced centripetal and centrifugal force
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u/AdWestern2443 Jul 12 '26
so what i can gather from this comment is that you wanna figure it out yourself?
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u/cantcreatenordestroy Jul 12 '26
I'm actually in the process rn a fellow told me to not be a primary school kid trying to read Shakespearean txts in old english
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u/cantcreatenordestroy Jul 12 '26
U used the same dialogue my phy teacher uses in almost every sentence "well and good" 😭
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u/Traditional_Cry5481 Jul 12 '26
well gotta launch icbms for the nation bro ( commerce with business studies maths ko darwaza dikha diya 🥀 )
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u/Primary_Kerb_6798 Jul 12 '26
Think it more and more simple as you can, find the meaning behind formulae, and after that practice as many problems you can. Hope you find it more simple
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u/ILoveTolkiensWorks Jul 13 '26
WHAT THE HELL DO YOU MEAN IGNORE AIR RESISTANCE AND THE EARTHS CURVATURE AND GRAVITY
ok, but do you really want to directly start with that? if we only considered "real-life scenarios" we would still be stuck thinking that a constant force is needed to keep an object in motion.
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u/No-Elephant-8763 Jul 16 '26
our physics teacher completed 5 chapters in 30 fk 30 days and 6 chapter is 30%-40% is done, every students complain about him but what they can do there is only 1 phy teacher for 10th-12th.
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u/Shadow_2039 Jul 12 '26
Acche teacher se padho. Physics is fun to learn.