LuduminaAT-09 · AT-U3 · Planned
Fusion and comparison with fission
Learning objectives
Explain fusion of light nuclei and energy release; compare with fission and prepare stellar link.
8463 §§4.4.4.2 / No Trilogy counterpart
DfE single-science pp.43–44 / Combined pp.35–36. Evidence checked 30 September–1 October 2026. Skills: WS1.2,3.6,4.1.
Explanation
Fusion joins light nuclei into a heavier nucleus and can release energy as a small mass difference becomes energy. It is distinct from chemical burning and from fission’s splitting. Quantitative mass–energy calculations are not required in this mapped GCSE lesson.
Concepts, equations and units: Light nuclei combine into heavier nucleus; some mass becomes energy; qualitative only, no E=mc² calculation requirement.
Prediction, demonstration and game exercise
Predict, observe, explain
Contrast joining/splitting nuclear diagrams; state particle colours and sizes are symbolic.
Planned learner game exercise
Sort reaction cards and complete store/transfer maps for fusion versus fission contexts.
Independent practice
Two reaction explanations and a comparison including nuclear changes and energy source.
Original practice example · Separate Physics
Classify a process in which light nuclei combine into a heavier nucleus with energy release.
Show working and model answer
Working / reasoning
The process joins rather than splits nuclei.
Answer
Nuclear fusion.
Exit check and success criteria
Joining/splitting correctly distinguished and energy source attributed to nuclear processes rather than chemical combustion.
During practice, compare the prediction with evidence and give an error-specific prompt. The exit item uses a fresh context or fresh values, answered independently.
Misconceptions, practical links and mastery
Check these misconceptions
Fusion splits heavy nuclei; Sun burns ordinary fuel; mass conservation in ordinary phase changes forbids nuclear mass-energy release.
Practical preparation
No RP; model only.
Virtual preparation and revision only. Required hands-on activities and school records remain separate.
Proposed mastery
0: not yet evidenced. 1: supported. 2: independent exit criteria met. 3: successful changed-context transfer. Advance at 2; revisit with fresh retrieval. These are not GCSE grades.