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La statique (notion des roues)
Matériel didactique : Tableau noir,craies blanches
Objectif opérationnel : A l’issue de la leçon, les élèves seront capables de connaitre les caractéristiques d’une forces

Rappel

Citez les moyens par lesquels on peut transmettre le mouvement de rotation ?

Rappel

Les moyens qu'on peut transmettre les mouvements de rotation:

  • Les roues  de friction
  • Poulies-courroies
  • Engrenage
  • Chaines et roues dentées
  • Roue et vis sans fin

 

Motivation

Comment avions-nous de finit la statique ?

Motivation

La statique est une partie de la mécanique qui étudié les conditions d’équilibre d’un corps.

Annonce du sujet

Qu'allons nous étudier aujourd'hui?

Annonce du sujet

Aujourd'hui nous allons étudier la statique (notion des roues)

Comment définir une force en statique?

La statique

Généralité

Notion de force : la notion de la force est donnée par la sensation de l’effort  musculaire il faut donc exercer  un tel  effort pour :

  • Modifier l’état de repos ou de mouvement  d’un corps

                Ex : glisser un livre sur la table

  • Déformer un corps

                Ex : plier un métal donc

En effet,  une force est un effet (cause) capable de modifier l’état de mouvement on de repos d’un corps ou de provoquer une déformation.

De quoi est caractérisée une force ?

Caractéristique d’une force

Une force est caractérisée par 4 éléments qui sont :

  • L’origine (le point d’appui A)
  • La direction on droites d’action xx´
  • L’intensité ou module
  • Le sens (

Une force est représenté par quoi?

NB : une force est représenté pour un vecteur, un vecteur le est une grandeur polaire ayant l’origine, la direction, le module et son intensité

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