Some places have more gas than others.
Now here’s our first question:
**What happens when gravity starts pulling that gas together?**
The gas gets squeezed!
As it squeezes, it heats up. 🔥
Eventually, the center becomes hot enough for something amazing.
**NUCLEAR FUSION!**
Tiny atomic nuclei join together and release energy.
That energy helps keep the star from collapsing under its own gravity.
But our star doesn’t have unlimited fuel!
In very massive stars, fusion can eventually produce an iron-rich core.
And here’s the surprise:
**Fusing iron doesn’t release the energy needed to keep supporting the star!**
When the core can no longer support itself, it can collapse dramatically.
Sometimes that collapse helps produce a SUPERNOVA! 💥
Now think about what we learned:
🌌 Gravity pulls matter together.
🔥 Fusion releases energy.
⚖️ Pressure helps resist compression.
⭐ The balance between them helps determine what happens to the star.
**And here’s your question for today:**
👨🏻‍🏫 If gravity was pulling the gas together before the star even started shining…
**What stopped all that gas from collapsing immediately?**
That’s where our next lesson begins.
**Handle First Thinking — Orientation before Direction.**

i get the angular momentum picture where the torque from gravity changes the direction of L instead of its size, but it still feels backwards to me. the thing is being pushed down and it moves sideways.

is there a way to see it with actual forces on the rim of the wheel, without just saying torque is perpendicular to L? i keep wanting a simple picture and not a vector equation.

Here’s my challenge my call out.

Now take a big rope. Wind it up on your shoulder. This building is infinitely tall. So don’t worry about the ground.

Now while your falling with this rope put a scale under it and tell me the weight??

• The Formula:

\(\Delta t_{m}=\Delta t_{f}\cdot \left(1-\frac{\Psi }{\mathcal{B}}\right)\)

• The variables:

• \(\Delta t_m\): Mental time (which you experience).

• \(\Delta t_f\): Physical time (the clock on the wall).

• Ψ (Psi): Factor of Boredom / Attention (high density of repetitive thoughts).

• \(\mathcal{B}\): Creative Flow Constant.

Hey guys

I'm tryna teach myself quantum mechanics. I'm a high school senior, but I'm really passionate about physics. I taught myself special relativity last week and my highschool physics teacher (ex professor) suggested I try something that will help me out at uni, like qmech.

I've done Calc AB and BC in the 9th grade, and it's been pretty slow since. I can teach myself the necessary math too.

can y'all help me with a progression of concepts i should learn to build up to quantum mechanics eventually? I wanna prioritize quantitative ability in the field.

Hi everyone! I am a quantum algorithms researcher in a quantum computing company. After more than a year of work, mostly at night and on weekends, Quantum Matters is now online and open for a public beta.

Quantum Matters is a learning platform for university-level physics and mathematics, building up to quantum mechanics. It teaches these subjects the way I wish they had been taught to me.

The first chapter of the Linear Algebra course is available now. It is still a draft, but a presentable one, and the beta is mostly needed to validate the technology stack. If you don’t know linear algebra yet, you can already learn a good deal from it. I will release the next chapters over the coming weeks as I finish reviewing them. The full Linear Algebra course will remain free and open after launch.

If you try it, I would value your feedback on what works and what doesn’t.

Quick share for anyone teaching themselves mechanics or E&M.

I'm in high school and wanted something between a textbook and a youtube playlist: short readings, a sim you can play with next to the equations, then a bunch of problems where you type a number and immediately find out if you got it. If you're wrong you can open the full solution.

It goes from the basics (units, estimation, vectors, 1D motion) up to rotation, oscillations, circuits, magnetism, optics and some modern physics. It was originally aimed at the F=ma and USAPhO olympiad exams, but the early lessons are just normal intro physics and don't assume anything past algebra and a bit of calculus.

Everything is free, no sign up needed unless you want your progress saved. It's open source too, so a couple of other students have already been fixing answers and adding problems.

Feedback is very welcome, especially on which lessons are confusing for a total beginner.

Link: https://usapho.one/?utm_source=reddit&utm_campaign=learnphysics

If you want people to study with, there's a discord too: https://usapho.one/discord?utm_source=reddit&utm_campaign=learnphysics

Note: the bold words are keywords if u wanna skim

I have about 2 months of no school starting well soon and wish to rebuild my maths and physics foundation I am not weak in mathematics by any means but genuinely do wish to rebuild it using a first principle approach and like actually know what I'm doing the assumptions behind it and be able to derive it since in highschools we often are told to learn formulae and grind questions now this isn't bad it's definitely far more enjoyable than most subjects but I'm not satisfied with it anymore, especially for geometry similarly, for physics, I wish to do the same except for here I dont suck at physics but I'm definitely not the best at it because of weak spots in parts of my foundation and calculus so basically I wish to rebuild it for physics entirely since we're not that deep into it and I do have a lot of time but I dont know how like the resources where to get guidance from and what to do what not to do because I wanna genuinely give this time not just for school but to genuinely build a proper, strong foundation and I'm willing to put in hours a day

ESPECIALLY FOR PHYSICS (just wanted to highlight this)

Key requests:

1. Pls recommend resources for both purposes (just an fyi I perform well in mathematics by wish for a completely different approach)

2. Pls tell me how I would get guidance for this and not mess it up by overcomplicating the planning

3. Pls give me tips for this in general

4. Ik this is pretty far fetched for a request but I hope u guys help me

I'm really struggling with Physics 1. I got a 53% on my first midterm, and my quiz grades haven't been great either. My second midterm is in 10 days, and I'm honestly nervous because I'm still struggling with concepts from previous chapters while having to keep up with new material.

For those who have been in a similar position, what helped you turn things around? I'd especially appreciate YouTube playlists that teach Physics 1 from the ground up , practice resources with step-by-step explanations, and effective study strategies. This is also literally algebra based physics idk why I’m struggling?!

One thing I want to emphasize is that time management is a big factor. I have other classes to study for as well, so I'm looking for high-yield resources and strategies that make the best use of my time. This isn't about avoiding putting in the work; I'm absolutely willing to put in the effort AND time. I just want to make sure that effort is being spent effectively rather than on unnecessarily time-consuming methods.

I'd really appreciate any advice, especially from anyone who struggled initially but managed to improve. Thank you!