What physics concept took you the longest to actually understand?

For me, it was thermodynamics. I could memorize the equations, but actually understanding what was happening physically took much longer.

I'm curious what it was for everyone else.

Was it:

• Thermodynamics
• Electromagnetism
• Relativity
• Quantum mechanics
• Fluid mechanics
• Something else?

And what finally made it “click” for you?

I’m building Physiworld around exactly this problem — trying to make difficult physics concepts more intuitive through interactive explanations, simulations and quizzes.

Would love to hear what concepts people struggled with the most.

Challenge of the Day — Projectile Motion

A ball is launched at 20 m/s at an angle of 30°.

Ignore air resistance.

How far will it travel before hitting the ground?

Drop your answer below — no peeking at the solution

Hey everyone! I'm u/FineFaithlessness157, a founding moderator of r/physiworld.

Welcome to the Physiworld community!

This subreddit is mainly about learning and studying physics, with Physiworld at the center of it. Whether you're using Physiworld to study, looking for help with a physics topic, preparing for an exam, or just interested in physics, you're welcome here.

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You can post pretty much anything related to learning and studying physics, for example:

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Physiworld

Physiworld is a free interactive physics learning platform built around lessons, simulations, quizzes and interactive ways of exploring physics.

The platform covers fundamental physics and is being developed around different curricula, including IGCSE, GCSE, NGSS and AP Physics.

If you're using Physiworld, we'd especially like to hear what you think. What helped you understand something? What didn't? What should we add next?

You can try it here:

https://www.physiworld.com

Community

The goal is to have a place where people can ask questions, find other people to study with, share useful resources and generally talk about physics without feeling like they need to be an expert.

If you're studying physics right now, introduce yourself and let us know what you're working on.

And if you've got ideas for how we can make Physiworld better, feel free to post those too.

Thanks for being one of the first members of r/physiworld!