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Exercices numériques
Domaine Science Sous domaine Science
Section Pédagogie Option Pédagogie Générale
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 bien calculer et représenter graphiquement un MRUA.
Réference R. FAUCHER (ITEM DE PHYSIQUE)
Activité initiale

Rappel

Comment s’exprime la vitesse instantanée ?

 

 

 

 

Rappel

La vitesse instantanée s’exprime par la valeur de la dérivée de l’abscisse du mobile par rapport au temps vinst

Motivation 

Motivation

Soit V& le vecteur vitesse instantanée d’un mobile à la date t1, V2 et vecteur vitesse à la date t2, les valeurs numériques de vitesses étant respectivement V1 et V2 pour caractériser le taux moyen de variation de vitesse on doit considérer le rapport :

Annonce du sujet

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

Annonce du sujet

Aujourd’hui, nous allons faire des exercices numériques.
Activité principale

Analyse

  1. La trajectoire de la lune dans son mouvement autour de la terre est approximativement circulaire de rayon 3, 7642. 108m. la période du mouvement est de 27 jours 13 min 12 s, c’est-à-dire 2,35792.106 s. Calculez la vitesse linéaire
  2. Un mobile parcourt une circonférence de rayon de 5 mètres d’un mouvement uniforme et fait 2/3 tour/seconde. Quelle est la valeur de l’accélération centripète.

 

Analyse

  1. Le mouvement d’une particule est défini par la relation

Un mobile se déplace sur une droite XX’ d’un mvt répondant à l’’équation X(m) = 2t2 + 4t + 5. Sa vitesse entre le moment du départ et l’instant  t = 3 s
Synthèse

Calculez la vitesse moyenne et l’accélération moyenne entre les temps t = 0 et t = 5 s dont un mobile se déplace suivant un axe. Selon la loi X = t3 – 4t2  + 2t.

Un  mobile se déplace suivant un axe. Selon la loi X = t3 –4t2 + 2t

  1.   X = t3 –4t2 + 2t,    t1 = 0 et t2 = 5 s
MessagesTimelineExceptionsViews7RouteQueries14Models18GateSessionRequest
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