An open learning engine · early preview
Code, systems, machine learning, physics. Each idea becomes a picture you can question: you call what happens, then watch it play out. The engine that draws it, MartyGraphics, is open source.
One engine · many worlds
Each stop is a real idea from a Morrowdock course. One scene description draws the picture, the numbers and the words, so they always agree. You make the call first; nothing gives the answer away.
Code Gym · two pointers
From the written lesson “Two fingers on the list” · not in the app yet
1 + 17 = 18 is too small. Which pointer moves?
What you take away: on a sorted list, each move rules one number out for good, so you need at most n − 1 checks instead of every pair.
System design · caching
From the authored caching lesson · not in the app yet · illustrative timings: 1 ms cache, 100 ms database
Make your call before you change anything.
What you take away: the average is dominated by the slow path, so the last few points of hit rate buy most of the speed.
AI Lab · covariance to PCA
From the AI Lab course “Covariance to PCA” · draft in review · not in the app yet
Each point drops a shadow onto the line. Keep the best line you can find.
What you take away: the direction that keeps the most spread is the covariance matrix’s top eigenvector, the first principal component.
Physics · force and motion
Physics practice is in the private iPad beta; this full lesson is a browser demonstration
The complete lesson runs below: a worked example, a guided change you control, then a fresh problem with the answer held back until you commit. A slope lab follows, where every arrow is a numbered quantity you can question.
What is real here. These stops are browser re-creations written for this page, drawn the way MartyGraphics describes scenes. MartyGraphics is open source as an early preview (Apache-2.0, Swift); its public templates include a two-pointer array and a binary-search tree, and its own native exports show them. The courses they come from are still being written.
Physics · a complete lesson
One idea, three steps: a worked example, a guided change, then a fresh problem with nothing given away.
Acceleration
a = F ÷ m
= 8 N ÷ 2 kg
= 4 m/s² right
| Net force | Mass | Acceleration | Distance in 1 s from rest |
|---|---|---|---|
| 8 N right | 2 kg | 4 m/s² right | 2 m right |
1 · Learn the idea
Acceleration is net force divided by mass. This 2 kg cart gets an 8 N push, so it speeds up by 4 m/s every second.
Released from rest, it covers ½ · a · t² = ½ × 4 × 1² = 2 m right in 1 s. The faint outlines show where it is every quarter second.
2 · Work it out with help
Still 2 kg. Set the net force, then release it and compare how far it gets in one second.
8 N ÷ 2 kg = 4 m/s² right · 2 m in 1 s
Divide the net force by the mass. Double the force and the acceleration doubles, and so does the distance covered from rest in the same time.
3 · Your turn
A 3 kg cart has a net force of 6 N to the left. What is its acceleration?
Take your time. The release button unlocks once you’ve answered, so you can check it.
Use net force ÷ mass. The acceleration points the same way as the net force.
MartyGraphics · the teaching board
Every arrow is a real quantity with a number, a direction and an explanation. Predict first, then change the slope: picture, maths and words move together.
Predict first
Static friction μs = 0.3, kinetic μk = 0.2, g = 9.81 m/s². The slope is the only surface it touches, and nothing else pushes or pulls on it.
Make a prediction (or skip) to unlock the controls.
| Marker# | Quantity | Value and direction |
|---|---|---|
| 1 | 25° rises to the right | |
| 2 | 4 kg starts at rest | |
| 3 | 39.2 N straight down | |
| 4 | 35.6 N perpendicular to the surface, away from it | |
| 5 | 16.6 N down the slope (part of W) | |
| 6 | 35.6 N into the surface (part of W) | |
| 7 | ? after you predict | |
| 8 | ? after you predict |
Tap an arrow on the board, or choose a row in the table. Each row and its arrow share a numbered marker.
Now explore: find the steepest angle where the block still stays put.
What is real here. A browser re-creation, in JavaScript, of the incline teaching model in MartyGraphics, Morrowdock’s native Swift graphics engine: same physics, numbered objects, step sizes and arrow colours. It does not run the Swift engine. The engine’s source also has Atwood, circular-motion, projectile, spring and third-law templates; their app placement is still being tested.
Starting small. Building with care.
Private iPad beta
Learn-first setup, explanations before guided practice, optional placement you can skip, and a saved next lesson to return to.
Submitted for private iPad testing. No public download; tester availability is unverified.
Private beta · one lesson
Explore variables: watch, predict, assemble and explain, then try a fresh problem on your own. Broader coding and interview practice is coming soon.
Coming soon
Why we’re building this
Morrowdock is an independent learning project built around one habit: understand a small idea, work through it with support, then try it yourself.
Questions? Contact hello@morrowdock.app.
Open by design · MartyGraphics is public
MartyGraphics is public under Apache-2.0 as an early preview. Other repositories and packages, course contributions, imports and exports are still being prepared.
The plan: a Free app with your own supported AI, and free Self-hosted server software. Both are still in development; hardware, hosting and external AI costs are separate. Plus, a hosted option, is planned. It is not for sale, and it has no price and no date.
Compare the planned options Explore the plan for creating courses
Before you join
The latest iPad build has been submitted for private testing. Tester assignment and download availability have not been verified, and joining the interest list does not grant app access. There is no public download or release date; iPhone and Mac are coming soon.
The submitted private beta adds one hands-on Code Gym variables lesson: watch, predict, assemble, explain, then try a fresh independent problem. Your Hub continues the exact lesson; drafts, help and reveal state are retained when you leave and return. Learn-first setup and optional placement remain. Broader tracks, Course Studio and the full generated-exam loop are still in development.
No. The cart lesson and the slope lab are browser demonstrations written for this website. The lab re-creates the incline teaching model from MartyGraphics, the app’s native graphics engine, but it does not run the engine and is not a screenshot or recording of the app.
Not today. The plan is a Free app with your own supported AI and free self-hosted server software; both are still in development. Plus, a hosted option, is planned. It is not for sale: no price and no date. Plus and account sign-in are not available.
Your chosen AI service may charge for usage. Paid AI is opt-in; supported connections are still being built. Joining the interest list is free.
Portable courses, import and export are our direction. The planned formats are not all available today. See the portability plan.
We record your interest in future Plus and open-source updates. Email updates are not active yet. Joining is no purchase or access guarantee, and we promise no launch date. You can request deletion.
Follow along
The interest list is on the home page. It is free to join; no access or launch date is promised. Email updates are not active yet.
How we handle your email, retention and verified deletion requests: read the privacy policy.
This is a free interest list, not a purchase or access guarantee. Read the interest-list terms.
