ex12.py

Created on March 18, 2026

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Question 2) Quelle force horizontale 
minimum sera nécessaire si elle 
souhaite maintenir son mouvement 
de glisse ?

Ici, la skieuse est déjà en 
mouvement à vitesse constante 
(accélération = 0). Tu dois 
utiliser le frottement dynamique
(ou cinétique).

Équation : Pour maintenir 
la vitesse, sa force de 
propulsion doit annuler exactement 
la force de frottement dynamique :
ΣF=0, donc Fpropulsion =Ffc 

Calcul : Ffc =μc ⋅N.
Ffc =0,05⋅588,6
Ffc =29,43 N

Conclusion pour l'examen : Elle
devra produire une force horizontale 
continue de 29,43 N pour compenser
le frottement et ne pas ralentir.

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