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Les mouvements rectilignes uniformes MRU
Domaine Science Sous domaine Physique, Technologie et TIC
Section Technique Option Electricité
Discipline Mecanique Classe 3ème
Matériel didactique Craies de couleur Auteur SCHOOLAP.COM
Objectif opérationnel Ala fin de cours, les apprenants seront en mesure de bien définir la mécanique générale.
Réference Mécanique premiere partie R. Basquine & mécanique générale.
Activité initiale

Rappel

Que veut dire :

Mouvement Rectiligne Uniforme

Rappel

  1. Définition

Un Mouvement est dit Rectiligne Uniforme lorsque le mobile parcourt toujours dans le même sens, des espaces  égaux en des temps égaux, sur une trajectoire rectiligne.

Activité principale

a=O          m/s 2

  • Loi des vitesses : la vitesse est constante puisque, le mobile parcouru des espaces égaux, en temps égaux.

v=constante 

 m/s

Synthèse

Exemple :

  1. Un ascenseur monte 12 étages de 3 m en 1 min 10 s

Calculez la vitesse d’ascension ?

  1. Un coup de tonnerre est perçu 22 s après l’éclair. Sachant que son parcours 340 m/s. Calculez à quelle distance est tombée l’éclair.
  2. Un piéton marche pendant 42 min à une vitesse constante de 3,6 km/h. Sachant qu’avant d’être chronométré, il a déjà effectué 1,5 km. Calculez la distance totale parcourue.

Données 1.

t= 12*3=36 m

e= 60+20 =80 S                  Inconnu V= ?

Formule 

e= v*t donc v=e/t= 36/80=0,45 ms

Données 2.

e= 22 v= 840 ms               inconnu   e=?

Formule et calcule e= v.t=340 m/s*22 s=340 m*22=7480 m

Données 3.

t= 42'=2520        v= 3,6 km/h=1 m/s

inconnu et calcule e=? donc, e= e o+v t=1500+1.2520=1500+2520=4020 m

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