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Type d’engrenage (roue menante/
menée)
Effet d’une rotation de la poignée
bleue sur les engrenages
Engrenage le plus rapide
Force multipliée
Engrenage marron (14 dents)
Menante
1 rotation complète (14 dents)
4
Engrenage jaune (34 dents)
Menée
Moins d’un demi-tour (14 dents)
La vitesse se perd dans le transfert
4
Tableau des données 1
1er train d’engrenages
(b) Placez un autocollant sur l’une des dents du deuxième engrenage marron (14 dents) qui partage le même
axe que l’engrenage jaune. Essayez de placer l’autocollant de façon à ce qu’il soit aligné avec celui placé
sur l’engrenage jaune.
(i) Tournez la poignée bleue
d’une rotation complète et
remarquez de combien de
tours les engrenages jaune
et marron se déplacent. Vous
pouvez compter le nombre
de dents, ou considérer le
mouvement comme celui
des aiguilles d’une horloge.
Par exemple, l’engrenage se
déplace de 9 heures à 2 heures.
Les étudiants doivent inscrire
leurs réponses dans le tableau
suivant.
(ii) Puisque les engrenages
jaune et marron ne sont pas
de la même taille, comment
expliquez-vous votre résultat
ci-dessus?
Les étudiants devraient remarquer que les deux
engrenages effectuent un peu moins de la moitié d’une rota-
tion complète.
Aidez les étudiants à comprendre que malgré leur différence
de taille, les engrenages effectuent la même proportion d’un
cercle parce qu’ils sont situés sur un même axe.
GUIDE DE I’ENSEIGNANT
LES MACHINES SIMPLES
Education
®
24


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