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FORCE CENTRIFUGE

Rappel

Un ascenseur de masse totale 400 Kms se déplace avec une accélération de 0,5 m/s2 sous l’action d’un câble/

La tension de ce câble à la montée est :

A. 4000 N, B. 3800 N, C. 4200 N, D. 4700 N, E. 4400 N

Données             Inconnues              Formule

M = 400 Kg          T = ?      T =  M (g+ ɤ)

ɤ = 0,5 m/s2                                        T = 400 (10+0,5)

g = 10 m/s2                           T= 400 + 200

                                                = 4200 N

Motivation

Comment appelle t-on la force qui maintient l'eau dans le seau ?

Annonce du sujet

Qu'allons nous étudier aujourd'hui ?

Rappel

Un ascenseur de masse totale 400 Kgs se déplace avec une accélération de 0,5 m/s2 sous l’action d’un câble/

La tension de ce câble à la montée est :

A. 4000 N, B. 3800 N, C. 4200 N, D. 4700 N, E. 4400 N

Données             Inconnues              Formule

M = 400 Kg          T = ?      T =  M (g+ ɤ)

ɤ = 0,5 m/s2                                        T = 400 (10+0,5)

g = 10 m/s2                           T= 400 + 200

                                                = 4200 N

Motivation

La force qui maintient l’eau dans le seau est appelée force centrifuge.

Annonce du sujet

Aujourd'hui nous allons étudier la force centrifuge.

Analyse

Qu’est – ce que  la force centrifuge ?

Qu’est – ce que la force inertie ?

Rappelons la formule de l’accélération centripète

Donnez la relation fondamentale de la dynamique.

Donnez la formule du poids.

Analyse

Qu'est-ce que nous venons d'étudier ?

Nous venons d'étudier la force centrifuge.

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