From: gehrab@gmail.com   
      
   On Saturday, October 28, 2023 at 3:28:43 PM UTC-5, Luigi Fortunati wrote:   
   > George Hrabovsky il 26/10/2023 11:12:16 ha scritto:   
   >> No, inertia is the ability of a body to resist being accelerated.   
   >   
   > Inertia is (first of all) a property of bodies and, therefore, every   
   > material body always has this property, at any moment, both before,   
   > during and after the collision (there are no bodies that have inertia   
   > at certain moments and in others don't have it).   
      
   But that does not make it a vector.   
   >   
   > Instead, resistance to acceleration is not always there, it is only   
   > there when acceleration occurs, because the two things are connected.   
      
   This is in error. Forces acting on a body accelerate the mass of the body. The   
   mass is always there, and it is a measure of inertia. This is encapsulated in   
   Newton's second law, F = m a, F is the applied force, m is the mass, and a is   
   the acceleration. F    
   and a are vectors, m is a scalar.   
   >   
   > There is resistance to acceleration if there is acceleration and there   
   > is no resistance to acceleration if there is no acceleration.   
      
   The mass is always there, otherwise how would the body know when to have mass   
   or not?   
   >   
   > Inertia in the absence of any acceleration (which must not resist   
   > acceleration) is a completely different thing from inertia in the   
   > presence of acceleration (which must resist acceleration).   
      
   Why?   
   >   
   > You can understand everything by looking at my animation   
   > https://www.geogebra.org/m/mjnqb8vk   
      
   Your animation demonstrates the conservation of momentum and the effects of   
   friction (a force caused by electromagnetism), so it has nothing to do with   
   inertia intrinsically.   
      
      
   George   
      
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