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Expliquez aux étudiants qu’ils peuvent facilement démontrer que la vis est un plan incliné.
Demandez aux étudiants de prendre une feuille de papier. Pliez le bas de la feuille de façon à ce qu’il s’enligne
avec le côté gauche. Coupez le long de la diagonale pour faire un triangle droit.
Demandez aux étudiants de prendre un marqueur et de dessiner une ligne le long du côté représentant la pente.
Ils devraient reconnaître qu’ils viennent de représenter un plan incliné. Demandez-leur de remarquer la différence
entre la longueur de l’inclinaison et les deux autres côtés.
Dites aux étudiants de placer le triangle de papier sur le bureau, la marque orientée face vers le bas de façon à
ce que les côtés non-marqués soient en haut et à gauche. Placez un crayon sur le papier en haut et enroulez le
papier autour du crayon.
Demandez-leur d’observer la marque du plan incliné. Ils doivent se rendre compte qu’elle forme une spirale,
comme le filet d’une vis.
Encouragez les étudiants à faire quelques recherches sur les vis et ses fonctions.
Threads
Body
le filet
le corps
GUIDE DE I’ENSEIGNANT
LES MACHINES SIMPLE
Education
®
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