From: wugi53@gmail.com   
      
   Op maandag 6 maart 2023 om 03:02:50 UTC-3 schreef Luigi Fortunati:   
   > The "apparent" force exists in the accelerated frame but does not exist   
   > in the inertial frame.   
   >   
   > For example, in the case of the slingshot, the (apparent) centrifugal   
   > force exists in the rotating frame.   
   >   
   > Does this mean that (in the rotating reference) there really is a   
   > centrifugal force acting on the stone or do we imagine that there is   
   > but, in reality, it isn't there at all?   
   >   
   > Obviously, in the second case, no one would ever think of asking to   
   > which fundamental force it belongs but, in the first case, if a force   
   > really acts on the stone, we should be able to establish what kind of   
   > force it is.   
   >   
   > Well, is the apparent centrifugal force that really acts on the stone   
   > during the rotation and in the rotating reference part of one of the 4   
   > fundamental forces?   
   >   
   > [[Mod. note -- No. The apparent centrifugal force is an artifact of   
   > working in non-inertial (in this case rotating) coordinates. -- jt]]   
      
   Don't we forget Newton's law here (action=reaction)?   
   In both positions, the anchor point and the rotating mass, two forces   
   hold each other in equilibrium.   
   In the anchor point, the centrifugal force transmitted via the rope is   
   compensated for at each moment by the ground reaction.   
   In the rotating mass, it is equally compensated by the ground reaction,   
   transmitted along the rope.   
   Even in the rotating system, the "rotating observer" will be aware of   
   their "free movement" being hindered by a reaction in the rope; and   
   conclude that this is accounted for by their not belonging to an inertial   
   system.   
   Consider being in a rotor: https://en.wikipedia.org/wiki/Rotor_(ride)   
   Do you imply that people are feeling fictitious forces, when they don't   
   see "proper" movement?   
      
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