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La résistance au roulement

6ème Mécanique - Résistance des matériaux (RDM)

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La résistance au roulement

Domaine	Professionnel	Sous domaine	Professionnel
Section	Technique	Option	Mécanique
Discipline	Résistance des matériaux (RDM)	Classe	6ème
Matériel didactique	Craies de couleur	Auteur	SCHOOLAP.COM
Objectif opérationnel	À l’issue de la leçon, les élèves seront capables de calculer la résistance de roulement.
Réference	Livre des notions de mécanique (Julemont) p104.
Activité initiale
Rappel Qu’appelle-t-on résistance passive ? Quelles sont les causes de frottement ? Motivation Quel est le corps le plus facile à déplacer ? Annonce du sujet Qu'allons-nous étudier aujourd'hui ?		Rappel C’est le contact de deux surfaces Motivation Le cylindre est le corps le plus facile à déplacer. Annonce du sujet Nous allons étudier la résistance au roulement.
Activité principale
Sur quoi le cylindre peut-il rouler facilement ?		Il est plus facile de faire rouler un cylindre sur un plan horizontal que de le faire glisser. Si les solides étaient rigoureusement indéformables, le cylindre chargé par la force P aurait avec son support une seule génératrice de contact. En réalité, les 2 corps se déforment plus au moins, selon leur élasticité, si bien que le contact a lieu souvent sur une place limitée par 2 génératrices A et B. Lorsque le cylindre roule, la déformation se propage dans le même sens que le déplacement. On peut montrer que l’effort nécessaire pour rouler le cylindre est donné par la force. Pour une charge sur la roue P donnée, la force F sera d’autant plus faible que f. P et F seront plus petits (corps durs) et que R sera grand (grande roue)
Synthèse
Cfr. Activité principale		Il est plus facile de faire rouler un cylindre sur un plan horizontal que de le faire glisser. Si les solides étaient rigoureusement indéformables, le cylindre chargé par la force P aurait avec son support une seule génératrice de contact. En réalité, les 2 corps se déforment plus au moins, selon leur élasticité, si bien que le contact a lieu souvent sur une place limitée par 2 génératrices A et B. Lorsque le cylindre roule, la déformation se propage dans le même sens que le déplacement. On peut montrer que l’effort nécessaire pour rouler le cylindre est donné par la force. Pour une charge sur la roue P donnée, la force F sera d’autant plus faible que f. P et F seront plus petits (corps durs) et que R sera grand (grande roue)

Messages Timeline Exceptions Views7 Route Queries14 Models16 Gate Session Request

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