Galileo
tracked motion
tracked motion
A move you can write down: how far against how long, then how fast — and how fast that itself changes (sträcka, hastighet, acceleration). Public start of this river.
Open
This river starts with motion
Physics
Part of Windrose
A thing moves. You track how far and how fast. Then you ask why it keeps going, what changes that, and where the push’s work went. Waves are not lesson 0.
Newton 1
Why a thing keeps going
Stubborn motion. No extra push needed to continue in a straight line (tröghet).
To be developed
Newton 2
What changes the motion
A push that lasts. is the name of that lasting change (kraft).
To be developed
Same stuff,
different clothes
different clothes
Where the push’s work went
and work: the same account, dressed as height, speed, or a squeezed spring (energi, arbete).
To be developed
The kettle,
physics side
physics side
Heat as energy you can stash in a kettle
This ledger: heat in, thermometer still, form changing (värme som energi).
To be developed
Teaser
Invisible push at a distance
Electricity: a push you do not have to touch (elektricitet). Flagged so the map does not pretend waves are the only next door.
To be developed
Shallows,
then Huygens
then Huygens
Sea waves come in almost straight, whatever the wind. Tool: the front slows in the shallows and swings (brytning / refraction). Later on this river, after motion and energy. Written, so it stays Open.
Open
Strings & voice
bridge from math
bridge from math
Same wave, now in air: denser / thinner pressure (slinky squeeze), pitch as how often, loudness as how far. Atlas: Math sky/sea trig ↔ Physics springs/sound (ljud · tryckvåg).
Why this sits here: beach refraction is a front in water; this page is the pressure ripple you hear — unlocked when the unit circle is done.
Locked
Same family
bounce
bounce
Where does the echo come from?
You shout at a cliff. A ship listens for sound bounced off rock under the sea. Tool: bounce (reflektion) — angle in equals angle out, measured from the upright.
Why this comes next: slowing and swinging is one trick of a wavefront. Bouncing is the same family, after the beach.
To be developed
Two gaps
the next wall
the next wall
Two gaps, calm strips
Fishermen already knew quiet lanes between islands. Two openings, a pattern of loud and still. Tool: interference (interferens) and a glimpse of bending around an edge (böjning / diffraction).
Why this comes later: one glimpse is enough after bounce. Dumping the whole two-source sheet is the next wall, not this page.
To be developed
Light
Light as a wave
Same family — bounce, bend, two slits — now for light. After water and sound, not instead of them.
Why this comes later: you already saw a front turn and a bounce. Light is that story at a scale you cannot paddle.
To be developed
Stop. This is as far as we go by hand. Past here you need a specialist’s tools. No field theory, no relativity as a method, no quantum as a toolkit. If a later page needs those, it has left this river.