Welcome

Ask Physics answers physics questions with answers you can check. Ask anything from a textbook problem to "how many rubber ducks would it take to stop a freight train?", and you get the number, the equation it came from (with its source), every assumption spelled out, units checked from start to finish, and an honest confidence score.

It runs on your machine, costs nothing, and calls no outside service. The language work is done by our own small models, the Fermi models, trained from scratch. The math is done by Noether, a symbolic math engine built on SymPy and Pint. The models never do arithmetic.

Start here

• Getting started: install it and ask your first question.
• Reading an answer: what the answer card tells you, and what "PARTIAL" and a low confidence mean.
• Asking good questions: phrasings that get answered.
• FAQ: including "why not just ask a chatbot?"

How it works

• How it works: the six stages every question goes through.
• The Fermi models: tellus, solem, and celeste, with their eval results.
• Noether: the math engine.
• Equations: every equation Ask Physics knows, one page each.
• Constants and the Glossary.

Building it

• Training the models
• The prose corpus and its licenses
• Contributing

Try it in your browser at askphysics.vercel.app, with no install and no account. These docs are there too, at askphysics.vercel.app/docs, with every formula typeset. The code is at shankar-sachin/ask-physics under the MIT license.