From: fortunati.luigi@gmail.com   
      
   Luigi Fortunati il 17/02/2023 17:37:48 ha scritto:   
   > What is the difference between the force accelerating the mass (F=ma)   
   > and the force deforming the mass (Hooke)?   
   >   
   > Can a force accelerate mass without deforming it?   
   >   
   >   
   > [[Mod. note --   
   > 1. Deformation can be quasi-static or dynamic, whereas acceleration   
   >    is necessarily dynamic.   
      
   Exact.   
      
   And this means that in one case it depends on the reference and in the other   
   it doesn't.   
      
   In one case it is relative, in the other it is absolute.   
      
   But how can force be relative and also absolute?   
      
   > 2. That depends on the force and the body-being-accelerated.  If the   
   >    force is somehow applied equally to each part of the body (e.g.,   
   >    a uniform gravitational field in the Newtonian perspective), then   
   >    the body can be accelerated without any deformation.  Or, if the   
   >    body is either very small or very stiff, and/or the acceleration   
   >    is very small, then the deformation may be negligibly small.   
   >    An important limiting case of this is the acceleration of a point   
   >    mass, which we define as a mass with no internal structure; a point   
   >    mass doesn't deform under acceleration.  Electrons are a well-known   
   >    example.  But if a force is applied to a macroscopic body, and is   
   >    *not* applied equally to each part of the body, then yes, the body   
   >    will deform.   
   > -- jt]]   
      
   No one is able to know what happens to the point mass, whether it deforms or   
   not.   
      
   I prefer to talk about macroscopic bodies where what is happening is clear and   
   evident, as in my simulation   
   https://www.geogebra.org/m/zjbrrcet   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)