diff --git a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/30.n2/20.fr/ 20.overview/cheatsheet.fr.md b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/30.n2/20.fr/ 20.overview/cheatsheet.fr.md
index 335792f50..9191dae3b 100644
--- a/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/30.n2/20.fr/ 20.overview/cheatsheet.fr.md	
+++ b/00.brainstorming-pedagogical-teams/40.collection-existing-pedagogical-content/40.classical-mechanics/30.n2/20.fr/ 20.overview/cheatsheet.fr.md	
@@ -12,4 +12,24 @@ lessons:
 
 #### Mécanique classique, n2, synthèse
 
---------------------------------------
\ No newline at end of file
+--------------------------------------
+
+transformation de Galilée
+
+<!-------------------------------------------------
+![](cadre-physique-galilee-transformation.gif)   
+![](cadre-classical-physics-referenciel-1-n1_v2_L1200.jpg)
+-------------------------------------------------->
+
+![](cadre-classical-physics-gallilei-transformation-2_v2_L1200.gif)   
+![](cadre-classical-physics-referenciel-1-n1_v2_L1200.jpg)   
+_simple flèche pour le niveau 1_
+
+![](cadre-classical-physics-gallilei-transformation-3_v2_L1200.gif)   
+![](cadre-classical-physics-referenciel-2-n1_v2_L1200.jpg)   
+_simple flèche pour le niveau 1_
+
+
+![](cadre-classical-physics-gallilei-transformation-1_v2_L1200.gif)   
+![](cadre-classical-physics-referenciel-1-n1_v2_L1200.jpg)   
+_simple flèche pour le niveau 1_