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Le mouvement circulaire varie
Domaine Science Sous domaine Physique, Technologie et TIC
Section Technique Option Mécanique
Discipline Mecanique Classe 4ème
Matériel didactique Tableau noir,craies blanches Auteur SCHOOLAP.COM
Objectif opérationnel A l’issue de la leçon, les élevés seront capable de calculer la vitesse angulaire moyenne
Réference R. THIBAUT, A.TOURNAY
Activité initiale

Rappel

Comment est la vitesse linéaire par rapport  à la circonférence

 

Rappel

La vitesse linéaire est tangente à la circonférence

Motivation

Que dire d’un mobile (d’un volume) d’une machine, qui tourne au variant sa vitesse

Motivation

Que la volant de la machine est animé d’abord d’un mouvement circulaire  et ensuite son mouvement est varié

Annonce du sujet

Qu'allons nous étudier aujourd'hui

Annonce du sujet

Aujour'dhui nous allons étudier le mouvement circulaire varie 

Activité principale

La définition du mouvement circulaire varie

Définition : un mouvement est circulaire uniformément varié quand la vitesse   (linéaire et angulaire) varient des quantités inégales en des temps inégaux

La vitesse angulaire moyenne

La vitesse linéaire moyenne

L’accélération angulaire

L’angle balayé

Arc parcouru

Vitesses

Angles et arc

Synthèse

Définition du mouvement circulaire varie

Définition : un mouvement est circulaire uniformément varié quand la vitesse   (linéaire et angulaire) varient des quantités inégales en des temps inégaux

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