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CONVERSION DE L'ENERGIE MECANIQUE EN ENERGIE THERMIQUE

4ème Pédagogie Générale - Physique

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CONVERSION DE L'ENERGIE MECANIQUE EN ENERGIE THERMIQUE

Domaine	Science	Sous domaine	Science
Section	Pédagogie	Option	Pédagogie Générale
Discipline	Physique	Classe	4ème
Matériel didactique	Une bille	Auteur	SCHOOLAP.COM
Objectif opérationnel	A la fin de la leçon, l'élève sera capable de distinguer logiquement les différentes conversions.
Réference	Bibliographie : KAZADI, V et Cie, Physique 4, Programme national de physique, 2008, page 115.
Activité initiale
Rappel Quelle est la chaleur spécifique à pression constante du cuivre sachant que son nombre de masse est 63, 54 ?		Rappel Quelle est la chaleur spécifique à pression constante du cuivre sachant que son nombre de masse est 63, 54 ?
Annonce du Sujet Qu'allons-nous étudier aujourd'hui ?		Annonce du Sujet Aujourd'hui, nous allons étudier la conversion de l'énergie mécanique en énergie thermique.
Activité principale
Analyse Prenons quelques expériences physiques. Comment peut-on calculer dans A_E_M?		Analyse Considérons un objet qui glisse sur un plan horizontal. Sa vitesse diminue progressivement jusqu'à l'arrêt. Pendant le mouvement, le corps a perdu son énergie mécanique. Elle a été convertie en énergie thermique. La variation de l'énergie mécanique est due au travail des forces de frottements de l'objet sur le plancher. Donc A_EM = Q Q et D_EM (J) Dans ce cas présent, le plancher étant horizontal, Ah = 0 et par conséquent D_EP = 0.
Synthèse
Qu'est-ce que nous venons de voir ?		Nous venons de voir la conversion de l'énergie mécanique en énergie thermique.

Messages Timeline Exceptions Views7 Route Queries14 Models17 Gate Session Request

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