From: poutnik@privacy.net   
      
   Dne 17/02/2018 v 11:14 Arindam Banerjee napsal(a):   
   > In the analysis of the Bohr model of the atom, the centripetal force is   
   > the electrostatic force between the electron and the protons in the   
   > nucleus; and the centrifugal force arises from the velocity of the   
   > electron, when held as a point mass.   
      
   Centrifugal force has 2 meanings:   
      
   1/Fictitious force in rotating coordinate system   
     - this is not the case of the Bohr atom.   
      
   2/Ordinary reactive force   
   to any force acting perpendicularly/centripetally to the motion   
   - in this case centripetal electrostatic force of the central mass.   
      
             more exactly of the reduced mass m1.m2/(m1+m2)   
             at place of centre of gravity.   
      
   BTW, the 2/ DOES NOT arises from the velocity.   
   The force value is directly determined by the centripetal force,   
   which, together with velocity and mass of the object   
   determine the curvature radius. Not vice versa.   
   >   
   > Centrifugal and centripetal forces are not fundamental forces. They are   
   > real or apparent forces resulting from the fundamental forces.   
      
   You confuse both meanings 1/ and 2/ above.   
      
   Being centrifugal and centripetal 2/  force   
   are scenario based attributes of force of near any origin,   
   in our case of the fundamental electromagnetic force.   
      
   In our everyday life,   
   any force is electromagnetic force except gravity.   
      
   > For instance, the gravitational force is the centripetal force that   
   > moves the Earth around the Sun, and the Moon around the Earth, etc.   
      
   Here, being centrifugal and centripetal 2/   
   are scenario based attributes of the classical gravity force.   
   For GR, this is not applicable.   
      
   >   
   > The centrifugal force, that which according to standard thought keeps   
   > the Earth from falling into the Sun, has to exist in some fashion. How   
   > can it exist, though, if it is merely apparent and not real?   
      
   There is no such a standard thought.   
      
   In classical mechanics, no force is needed   
   to keep Earth from falling on the Sun.   
      
   As the centrifugal force 2/   
   does not act on the Earth, but on the Sun.   
      
      
   --   
   Poutnik ( The Pilgrim, Der Wanderer )   
      
   A wise man guards words he says,   
   as they say about him more,   
   than he says about the subject.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)