phmeca.py

Created by arthurboubault

Created on February 08, 2022

753 Bytes


coord cart: 
  dom=dx ux+ dy uy + dz uz
   v= 
   a= d2x ux + d2y uy+ d2z uz
coord cylindriques et pol:
  OM= r ur+z uz
  si z=0: x= r cos o et y=rsin o
  r= racine X^2+y^2
  dom= dr ur + r do uo +dz uz
  v=
  duo/dt= -do ur
  dur/dt= d0 u0
  a=(d2r-rdo^2)ur + (2dr do+rd2o)
  uo + d2z uz
  
coord spher:
  OM=r ur
  x= rsinocosf y=rsino sinf z=rcoso
  dom= dr ur + r do uo +r sin o df uf

v=dom/dt a=dv/dt 
mvt rectiligne: deplace le long 
d'une droite
uniforme: norme v=cste
accélére si norme de v aug
dec : dim
mvt circu:
  OM= r ur v= v uo a= -v^2/R ur + dv/dt uo
base frenet: vecteur T 
tangent a la traj en M et oriente 
sens du mvt
vec N : orthogo a T et dirigé vers
inter du cercle(de la traj )
v= v(t)T a= dv/dt T + v^2(t)/R N

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