Track recap
Compact review built from the authored track order and the same local-first concept progress already saved in this browser.
Use oscillation as the entry point, lock down wave speed and wavelength, carry that into longitudinal sound and pitch-versus-loudness cues, add beats as the nearby-frequency superposition bridge, then move into Doppler shifts, interference, standing-wave patterns, and open-vs-closed air-column resonance without losing the live connection between motion and graph.
About recap mode
Keep the authored order, then open the extra explanation only when you need to understand how recap is choosing the next review move.
How it works
Recap mode does not invent a second curriculum. It keeps the existing starter-track order, then changes the prompt and suggested action with the current mastery and progress signals.
Keep using concept pages
Recap links only jump you to the most useful surface for a fast review. The simulation-first concept pages still carry the real teaching work and keep the guided path intact.
Recap steps
Focus badges and button targets come from the current mastery and progress signals. The next ready checkpoint still stays in the loop.
Simple Harmonic Motion is still the next guided step in this authored order. No finished quick test, solved challenge, or completion mark is saved yet.
Start here before moving into Wave Speed and Wavelength.
This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.
Builds on Simple Harmonic Motion before setting up Sound Waves and Longitudinal Motion.
This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.
Builds on Wave Speed and Wavelength before setting up Pitch, Frequency, and Loudness / Intensity.
This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.
Builds on Sound Waves and Longitudinal Motion before setting up Beats.
This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.
Builds on Pitch, Frequency, and Loudness / Intensity before setting up Doppler Effect.
This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.
Builds on Beats before setting up Wave Interference.
This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.
Builds on Doppler Effect before setting up Standing Waves.
This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.
Builds on Wave Interference before setting up Resonance in Air Columns / Open and Closed Pipes.
This concept stays in the recap because it completes the authored track story, even if you have not reached it on this browser yet.
Capstone step after Standing Waves.
