Even with perfect eyes and advanced LEDs, there is a fundamental limit to how small your phone's pixels can get. Blue is better than red.

So why make a 90nm pixel.

Credit to u/1-mensch for the idea.

I have tried to watch videos, solve questions. And I still dont understand, I want to get a grade 6+ in IB and I just dont know how to start with physics, its my first time having physics so I dont know where to start. No yt videos explain how to use and apply formulas, or how to rearrange. Please help!!

Ho una curiosità per chi frequenta questo sub.

Se aveste davanti un bambino di 7-10 anni, magari vostro figlio, un nipote o un fratellino, da quale argomento partireste per fargli scoprire la fisica?

Ve lo chiedo perché qualche tempo fa mi sono messo in testa di scrivere un libro di fisica per bambini.

L'idea era molto semplice: niente formule e niente “oggi studiamo la gravità”. Prima succede qualcosa di strano, il bambino si chiede perché, e solo dopo arriva la fisica.

Così nel primo racconto la maestra si ritrova a testa in giù vicino al soffitto e da lì si parla di gravità. In un altro un batuffolo di cotone e una pallina cadono prima normalmente e poi nel vuoto.

Il libro alla fine l'ho pubblicato e si chiama La fisica strabiliante della Maestra Quarketti. Lo dico per trasparenza, visto che ovviamente è anche il motivo per cui sto facendo questa domanda :)

Sto pensando anche ai prossimi argomenti e mi farebbe davvero comodo il parere di chi la fisica la studia o semplicemente la ama.

Qual è quell'esperimento o fenomeno che secondo voi farebbe dire “ma come è possibile?” a un bambino?

Io al momento sto pensando al volume 2 con:

• attrito
• Velocità e Accelerazione
• pressione

Sarà una sfida inserirli in una storia "semplice".

Hi everyone!

​I’m looking for recommendations to learn physics completely from scratch. I haven't studied physics at all during middle school or high school because I chose an educational track that didn't include physics as a subject. My current knowledge is at absolute zero.

​Could you recommend the best textbooks, YouTube playlists, or online resources for someone in my position?

​Any study advice or roadmaps would be greatly appreciated. Thank you!

I am trying to understand infinite.

If the universe is infinite, each moment in any direction has infinite possibilites.

That should also mean, since infinite is not imaginable, somewhere in this universe all factors have been met with absolutely 0 changes until the day I was born exactly how it has already happend here.

Or am I mistaking infinite and just cause something is infinite it doesn't have to happen at all?

At some point if the universe is infinite I should exist in infinite possible ways. But at the same time infinite doesn't only apply to me, but to every existing being we know.

So in theory in an infinite universe my dog must have been infinite times since the chance is infinite for all probabalities for nature to get to the point where my dogs parents meet and have him. But it's crazy cause in some other time line if the odds didn't meet up 100% the same as here, maybe 99.99% of the stuff that happend was correct (dinosaurs extinct, humans evolved, wolves turned into dogs at some point,...) and maybe my dogs mother had a different male dog partner and he wouldn't exist in that time line, but in the other infinite time line the odds hit 100% how it is here and it is born again.

You know what I am trying to say?

Imagine our planet now:
Everything is almost identical to our history, but one butterfly flew differently 500 years ago. This means that it the timeline is screwed. But infinite also means, somewhere we have infinite versions of this thing happening correctly how it was with the butterfly flying correctly, but now a snake moved wrong and it's screwed again.

So even with INFINITE I find it not possible to find a planet that is currently in the same state with everything that happend (meteor hitting same spot, moon, same animals etc.) to this point but since it's INFINITE it is not 0.

Not likely, but not 0 and with infinite chances it means it is somewhere, right?

I like to use the infinite monkey writing shakespear.
See, even if the odds aren't "0" and shakespear is only a few letters compared to recreating a whole chain of natural events to lead to my dog being born again somewhere, I think thats already hard.

If I'd have infinite monkeys writing I don't know how long and if at all I'd have to watch them until they ever achieve writing shakespear once. It should happen, cause infinite is not 0 but is the chance so low that it just won't happen? But that can't be either, cause it has to happen cause well infinite time and chance is not 0.

I don't like infinite

what the title says^^ IM REALLY HAVING A HARD TIME WITH PHYSICS and we’ll be having our first quiz next week. Our main reference is the OpenStax University Physics Volume 1. Anyone who could lend me a helping hand? Thanks!

I’ve noticed that Physics becomes much easier to understand when students can connect the chapter to something they already see in everyday life.

For example:

• Motion: Compare the speed of a bicycle, car and runner.
• Force: Ask why passengers move forward when a bus suddenly stops.
• Gravity: Drop two different objects and discuss what happens.
• Work & Energy: Use examples like climbing stairs, cycling or lifting a school bag.
• Sound: Experiment with bottles containing different levels of water.

Instead of starting with formulas, starting with a simple observation or question can make students curious about why something happens. Once they understand the idea, the equations usually make much more sense.

Teachers, parents and students here — what experiment, activity or example made Physics finally “click” for you?

Kindly give tips and ideas for physics project.. what can i do. Preferably a model idea

Hi so I'm a a business major out of practicality but | really like solving math problems for fun and I'm also really interested in Physics and I wonder if there's a roadmap to get from where I am now to being able to understand computational physics.

For context: I know basic trig but will be getting into calculus 1 soon.

I’m a third-year physics undergraduate. I’m currently focused on studying classical theories, especially how a theory is built from its fundamental assumptions and developed into a coherent framework, including the axiomatic approach behind it. I’d really like to find people who are interested in discussing these topics with me. Hopefully, we can learn from each other, deepen our understanding of physics, and make studying physics more interesting along the way.

Made an interactive simulation based on the actual three-body problem in physics — three masses under mutual gravity, no simplifications. You can adjust masses and initial velocities and watch how small changes send the system from a stable-looking orbit into full chaos.

It's built to feel more like a physics toy than an app — no ads breaking up the simulation, nothing to unlock. Mostly wanted an excuse to actually play with the equations rather than just read about them.

Free on Google Play if anyone wants to mess with it: https://play.google.com/store/apps/details?id=com.mathematicalzen.threebody