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Exercices

RAPPEL

Que dit le coefficient de frottement 

MOTIVATION

donner la formule pour calculer la puissance et l'énergie.

ANNONCE DU SUJET

Aujourd’hui nous allons étudier

RAPPEL

Le coefficient de frottement dit : c’est l’angle de la tangente formé entre l’effort de traction et le poids de l’objet.        f= F/P

MOTIVATION

L’énergie : W=F×e×f         en translation

                 W=F×2πr×r       en rotation

Puissance : P=Wt=F×e×ft    

ANNONCE DU SUJET

Exercices

Comment calcule t-on l'énergie?

Exercice

La charge supportée par le coussinet inférieur d’un palier graisseur à bague est de 2500N. le diamètre de l’arbre est de 50mm et la vitesse de rotation est de 300tr/min. 

  1. Le travail absorbé par le frottement pendant 1h avec f=0,10 est (Nm) :

1.  3,925                    2.  39250               3. 39,25                            4.  625                   5. 392,5

Résolution

Donner la formule pour calculer la puissance et l'énergie.

L’énergie : W=F×e×f         en translation

                 W=F×2πr×r       en rotation

Puissance : P=Wt=F×e×ft    

MessagesTimelineExceptionsViews7RouteQueries16Models18GateSessionRequest
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