physique2.py

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Created on February 22, 2021

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Aide physique 2


Chapitre 12 Force

Ec ( J)= 1/2*m(kg)*(v**2) en m.s
Travail d'une force F constante lors du déplacement AB est definie par :
  WAB(en joule) (F_)=F_*AB_= F(en N)*AB ()en M*cos angle entre F et AB
WAB (F_)>0 : angle sup ou egal à 0 et inf à 90, favorise déplacement = moteu
WAB (F_)=0 : angle = 90, agit pas sur le deplacement, travail nul
WAB (F_)<0 : angle entre 90 et 180 compris, s'oppose au déplacement, travail 
resistant

Théorème énergie cinétique :
  Variation Ec ( en J)= EC(B)-Ec(A)=EWAB(F_) ( en J)
  
Epp=m(en kg)*9,81*z(en m)
WAB(f_) ( en J)= -f( en N)*AB( en m)
Em=ec+epp
Sans frottement Em se conserve conversion ec epp
Variation Em = EWAB(F_ non concervative)

Poids= m*g

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