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oPhysics
By Tom Walsh. Visit oPhysics
Desk research from the maker's own pages. Not yet tried by us. Checked 2026-10-24.
A free collection of interactive physics simulations made by a retired high school and AP physics teacher. It covers kinematics, forces, energy, waves, light, electricity, rotation, fluids and modern physics, plus drawing tools for circuits and force diagrams and some fun extras. A student opens a simulation, moves sliders and watches the graphs and motion change. Most are built with GeoGebra and run in the browser with no account.
Our take: A solid free tool for high school physics students and teachers; younger children will find it too advanced.
Checked in a browser
A browser check on 2026-10-25: what loads, the ads and trackers we saw, and what a child meets first. Not a hands-on test.
| Child safety: 5 out of 5 | No ads or chat; links out only to GeoGebra and PayPal. |
|---|---|
| Data: 5 out of 5 | No ad, tracking or analytics networks, and no cookies set. |
| Ease: 2 out of 5 | The page is laid out for a desktop: on a phone the text runs off the right edge. |
| Cost honesty: 4 out of 5 | Free; a PayPal donate link. |
What we found
- Contacted 2 outside sites (douwe.com and Google Fonts) and set 0 cookies.
- 0 ad, tracking or analytics networks detected.
- On a phone-sized screen the update list and map are cut off on the right.
- Made by a retired high school physics teacher; links to PayPal and GeoGebra.
From the test: A clean, tracker-free set of free physics simulations for teens, better on a laptop than a phone.
| Ages it suits | about 13-18 (high school physics) |
|---|---|
| What its terms say about age | Not stated: the site has no terms of use. It allows free use for non-profit education. (terms) |
| Price | Free. Free; donations welcome (Oct 2026). |
| Works on | Web |
| Account | No account needed |
| Ads | None |
| In-app purchases | None |
| The AI in it | No AI. |
What's good
- Free, no account, no ads
- Wide range of high school physics topics
- Made by an experienced physics teacher
- Good for seeing graphs and motion together
Watch for
- No privacy policy or terms
- One-person project, updated as time allows
- Pitched at high school level, too hard for young kids
- Loads third-party GeoGebra code
Data and privacy
Not stated; the site has no privacy policy. Simulations load GeoGebra components from geogebra.org. Read the privacy policy.
Does it work?
No independent study found; the maker's own claims only.
In the Big Index
- On the list 16 best science games and simulations for kids
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Where these facts come from
Prices, terms and features change. Nobody paid to be listed, nothing here is an affiliate link, and Peabody never rates itself. Where we and the maker disagree, the maker's own pages are the ones to trust.