phos.py

Created by arthurboubault

Created on February 08, 2022

690 Bytes

Puissance P(f)= f.v
trav ele= f*dom=f.v dt=Pdt
trav glob= Int ta a tb Pdt
Ec=1/2mv^2
Tec:
  Wa->b = Ec(B)-Ec(A) (pr trouv v en un pt)
  dec/dt =P= Si P(fi) (equa diff mvt)
  dec=trav elem
  
force conserv: travail ne depend pas
du chemin suivit mais que des pts
trav elem= -dEp

force conserv:
  Ep= +- mgz+A
  Ep=k/2 (l-l0)^2+A
  Ep= -G m1m2/r
  
Em= Ec+Si Ep (fi)
Tem:
  Wnc=diffEm
  dEm/dt=Pnc
  dEm=travail elem nc
  
UNE FORCE DONT LA DIR EST ORTH
AU DEPLACEMENT (a v) NE TRAVAILLE
PAS DC =0

Ex: tec:
  dEc/dt= P() + P()
  d/dt(1/2 m r^2 o'^2)=fv
  1/2 mr^2 .2o'o''=...
  
autre ex:
  Wa->b= Ec(m)-Ec(A) 
  (vit nul => Ec=0)
Or Wa->b (f)= integr a à m f.dOM
Donc ...

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