From: arl_123234@hotmail.com   
      
   On 11/13/2017 12:58 AM, Luigi Fortunati wrote:   
   > Centrifugal force is an "apparent" force.   
   >   
   > Ok, but I have a doubt and I hope you can clarify it.   
   >   
   > The sling rotates and the hand exerts a real centripetal force on the   
   > rope.   
   >   
   > For the third principle, even the rope exerts an equal and opposite   
   > force (hence centrifuge) on the hand.   
   >   
   > How is possible that the two opposing forces, one is real and the other   
   > apparent?   
   >   
      
   Hello, and according to Isaac Newton, for every action there is an equal   
   and opposite reaction.  A mass that is forced to rotate about a central   
   point as a result of gravity, a rope, etc, is experiencing a continuous   
   change of momentum (a quantity having both magnitude and direction).   
   The mass is accelerating towards the center, which means a force is   
   being applied to the mass.  (An unconstrained mass would travel in a   
   straight line.)  I think the term "reaction" vs "apparent" is more   
   accurate in describing centrifugal or other such forces.  Sincerely,   
      
   --   
   J. B. Wood	            e-mail: arl_123234@hotmail.com   
      
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