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Mouvement rectiligne sinusoïdal
Domaine Science Sous domaine Science
Section Littéraire Option Latin Philo
Discipline Physique Classe 6ème
Matériel didactique Craies de couleur Auteur SCHOOLAP.COM
Objectif opérationnel A l’issue de la leçon l’élève sera capable de définir et calculer le mouvement rectiligne sinusoïdal.
Réference R. FAUCHER (PHTISIQUE) 6ème p.40-42
Activité initiale

Rappel

Donnez la formule de chute avec vitesse initiale ?

Rappel

Motivation 

Comment  appelle-t-on le déplacement d’un corps ?

Motivation 

Le déplacement d’un corps est appelé un mouvement.

Annonce du sujet

Qu'est ce que nous allons étudier aujourd'hui ? 

Annonce du sujet

Aujourd’hui, nous allons étudier le  mouvement rectiligne sinusoïdal.
Activité principale

Analyse

Qu’appelle-t-on le mouvement rectiligne sinusoïdal ? 

Quels sont d’autres noms des mouvements rectilignes sinusoïdaux ?

Expliquez la rencontre  ce type de mouvement ?

Analyse

Un mouvement rectiligne est dit sinusoïdal quand l’abscisse est une fonction sinusoïdale du temps.

Les mouvements rectilignes sinusoïdales sont également appelés :

Mouvement vibratoire sinusoïdal

Mouvement harmonique simple 

Mouvement oscillatoire sinusoïdal.

Ce type de mouvement se rencontre assez rarement à l’étape (pur) mais de nombreux mouvements de va et vient s’en rapprochent beaucoup  

Exemple : 

  • Piston d’un moteur tournant  régulièrement
  • Vibration d’une corde d’instrument de musique
  • Un ressort mieux d’une masse

 

 
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