XPost: alt.home.repair, alt.sci.physics, uk.d-i-y   
   From: shy543@gmail.com   
      
   "NY"  wrote in message   
   news:Odqdnc3cerV429fBnZ2dnUU78UXNnZ2d@brightview.co.uk...   
   > "Steven"  wrote in message   
   > news:gauuddFbvofU1@mid.individual.net...   
   >>   
   >>   
   >> "Commander Kinsey"  wrote in message   
   >> news:op.zv457rk6wdg98l@desktop-ga2mpl8.lan...   
   >>> On Thu, 24 Jan 2019 21:26:37 -0000, Steven  wrote:   
   >>>   
   >>>>   
   >>>>   
   >> When say it decides you are falling backwards, and moves back,   
   >> while you are standing on it, the complete assembly of you and   
   >> the scooter moves back and it doesn't change where it is relative   
   >> to the person's center of gravity.   
   >>   
   >>> Let's say you're stood stationary and upright on it, not moving.  Now,   
   >>> you lose your balance a little and begin to fall over backwards.  Your   
   >>> feet tilt backwards, the device senses this, and moves backwards.   
   >>> You're now still over the device   
   >>   
   >> Yes, but it can't move under the center of gravity while your feet are   
   >> still on it.   
   >   
   > You've forgotten Newton 3: "for every action, there is an equal and   
   > opposite reaction".   
      
   Nope.   
      
   > It moves the wheels by the motor exerting a torque on them. This causes an   
   > equal and opposite torque on the scooter-and-human,   
      
   Yes.   
      
   > thus moving the person's C of G relative to the axle   
      
   Nope, because the tilt of the human doesn't change much.   
      
   > until the C of G is once again directly over the axle.   
      
   Fraid not.   
      
   > This is how it corrects for the person leaning too far forwards or   
   > backwards.   
      
   No, it applies force, it doesn't shift the CoG.   
      
   > If the person leans back, the sensors detect that the scooter is tipping   
   > backwards, and rotates the wheels backwards, thus tipping the person   
   > forwards.   
      
   By force, not by moving the CoG   
      
   --- SoupGate-Win32 v1.05   
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