Physics for Stupid People like me

Shawn,

I have some of this Working, and I really appreciate you taking as much time as you did explaining this to me.

These Statments I understand, as I now have my Arrow Moving.

TFormNormal 0, 0, 1, Arrow, 0
Thrust_Nx# = TFormedX()
Thrust_Ny# = TFormedY()
Thrust_Nz# = TFormedZ()

Where does the Gravity Vector come into play. My Code Below is with your help, How do I add the gravity? I want to make sure when my character is heading up a hill, he starts to slide backwards if I apply no forward thrust

gravity#=9.8
Friction#=.5
AngularV#=360
PhysicsTime#=.001
Time=MilliSecs()
Pointer=CreateSphere(8)
ScaleEntity Pointer,.1,.1,.1
EntityColor Pointer,255,0,0
Pointer1=CreateSphere(8)
ScaleEntity Pointer1,.1,.1,.1
EntityColor Pointer1,0,255,0

Repeat
 	 If KeyDown(205) 
			TurnEntity Character\Body,0,-AngularV#*PhysicsTime#,0
			End If
			If KeyDown(203)
				TurnEntity Character\Body,0,AngularV#*PhysicsTime#,0
			End If 
			If KeyDown(57)
			If Not Animating(Character\body) Then Animate Character\Body,3,3,1
				Thrust#=2
 			Else
				Thrust#=Thrust#*.95
			EndIf 

			TFormNormal 0, 0, 1, Character\Body, 0 
			Thrust_NX# = TFormedX() 
			Thrust_Ny# = TFormedY() 
			Thrust_Nz# = TFormedZ() 
			
			TFormNormal 0,-1,0,Character\body,0
			  
			Grav_NX# = TFormedX()  
			Grav_Ny# = TFormedY() 
			Grav_Nz# = TFormedZ() 

			
			Character\Vx# = ( Thrust_Nx# * Thrust#)  + (Grav_Nx#*Gravity#) 
			Character\Vy# = ( Thrust_Ny# * Thrust#)  + (Grav_Ny#*Gravity#) 
			Character\Vz# = ( Thrust_Nz# * Thrust#)  + (Grav_Nz#*Gravity#) 
 
			Character\Speed#=Sqr(Character\VX#^2+Character\VY#^2+Character\VZ#^2)
		  

			
			
			LinePick EntityX#(Character\Body),EntityY#(Character\Body)+5,EntityZ#(Character\Body),0,-10,0,0.2
			TranslateEntity Character\Body, Character\Vx#*PhysicsTime#,Character\Vy#*PhysicsTime# , Character\Vz#*PhysicsTime# 
 			AlignToVector Character\Body,PickedNX#(),PickedNY#(),PickedNZ#(),2,.15
 
			PhysicsTime#=(MilliSecs()-Time)/1000.00
			Time = MilliSecs()
			If Time > F_time Then
				F_Time = Time + 1000
				FPS = Fcount
				fcount = 0
			Else
				fcount = fcount + 1
			End If
	
	Update_Camera(PhysicsTime#)
	
	UpdateWorld	
	RenderWorld  
			;PositionEntity Pointer ,EntityX#(Character\Body)+(Character\Vx#),EntityY#(Character\Body)+(Character\Vy#),EntityZ#(Character\Body)+(Character\Vz#)
			;PositionEntity Pointer1,EntityX#(Character\Body)-(Grav_NX#),EntityY#(Character\Body)-(Grav_NY#),EntityZ#(Character\Body)-(Grav_NZ#) 
	
 

	Text 10,12,Thrust_NX#+" "+Grav_NX#
	Text 10,24,Thrust_Ny#+" "+Grav_Ny#
	Text 10,36,Thrust_Nz#+" "+Grav_Nz#
	Text 10,48,"Entity Yaw"+EntityRoll(Character\body)
	Flip
	     
Until KeyHit(1)

Why Doesn't My character Slide down the slop he is on?
I know you don't have the graphics, but I can climb up a slope but once I get up I can't go back down the slop. It's like gravity on a slop works in reverse.
Regards,
Eric