G5T11: why the total mass always holds — how it looks on TimeBack
What this is. The topic in the order a student meets it — intro, each lesson, mixed practice, summary, PP100 — each part rendered in David's mimic of the TimeBack player: one column of cards, revealed one at a time by Continue. Every page's blue bar has Previous / Next, so you can walk the whole topic.
A lesson page: the video (or, until it exists, what it will say) → its one question → the whole article, one card per subtitle, figures where they belong → the quiz.
What the mimic cannot show. On the real platform the video is a separate activity before the lesson; here it sits in the first card. Typed-word answers and put-in-order tasks, which the player has but the mimic does not, appear as "Practice" cards with the answer printed. The intro poll is a pick where every reply is right. Two-option questions show as two-option MCQs (on the real platform they become a two-word pick). The PP100 is a note; its bank is on the reviewer page.
Tip: add #auto=end to a page's address to see it fully revealed and answered; #auto=wrong shows the red retry state.
| Part | Title | Video | Cards in all | Teaching cards | Checkpoints | of which numeric | Practice cards (not gates) |
|---|---|---|---|---|---|---|---|
| Topic intro | Topic intro: why the total mass always holds | transcript | 2 | 0 | 1 | 0 | — |
| L01 The total mass holds through every change | The total mass holds through every change | transcript | 16 | 5 | 10 | 0 | — |
| L02 Measure the mass before and after the change | Measure the mass before and after the change | transcript | 17 | 7 | 8 | 0 | 1 order |
| L03 A result counts for more when another group gets it too | A result counts for more when another group gets it too | transcript | 15 | 6 | 8 | 0 | — |
| L04 Add the solid to the liquid: the mass holds when it dissolves | Add the solid to the liquid: the mass holds when it dissolves | transcript | 16 | 6 | 7 | 0 | 2 typed-word |
| L05 The mass holds when the state changes inside a sealed container | The mass holds when the state changes inside a sealed container | transcript | 15 | 5 | 7 | 0 | 2 typed-word |
| L06 Where the missing mass went | Where the missing mass went | transcript | 15 | 5 | 8 | 0 | 1 typed-word |
| Mixed practice | Mixed practice: why the total mass always holds | — | 13 | 0 | 10 | 0 | 1 typed-word, 1 written |
| Topic summary | Topic summary: why the total mass always holds | transcript | 4 | 0 | 3 | 0 | — |
| PP100 | PP100: why the total mass always holds | — | 1 | 0 | 0 | 0 | — |
Back to the topic · Built by build_tools_timeback_mimic.py from the course content files and incoming/timeback_mimic/timeback_mimic.html.