From: roland.franzius@uos.de   
      
   Am 07.08.2018 um 09:04 schrieb Luigi Fortunati:   
   > Do you need more force to push the heavy cart uphill (at constant   
   > speed) or to keep it still?   
      
   To keep a mass at constant speed in a constant gravitational field the   
   force of weight  along the slope of angle alpha Fg = -m g sin alpha has   
   to be compensated exactly by the momentum transfer dp/dt in that   
   direction. The force is the same independent of the constant velocity.   
   At rest the work done is zero because the distance is zero.   
      
   In a motion with constant speed v the power is P = F.v and the potential   
   energy gained is A = F * v * t = F * s   
      
   --   
      
   Roland Franzius   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)