[dleviwing]

Originally Posted by Tina David consider the number line: How would you regard/explain the following - motion in negative direction motion in positive direction motion at rest neutral position

Hi Tina;
Ultimately there are no states of negative or positive, forward or backward, up or down motions. Every motion is compared to a reference point that allows us to give mathematical sign to the action. If your reference is the absolute start of the universe, then nothing is negative; everything is moving positive to that reference. Ask yourself which way is up, down, forward, or backward in the space between the galaxies. Given that we are human and like to be at the center of things, we tend to view our place in the universe as the center of existence. See; we haven’t changed in over 2000 years! The only neutral reference for motion is what may have existed prior to the event that initiated our universe. Giving sign to the motion is more for mathematical convenience so we don’t have to explain a beginning.

Motion is always measured relative to a reference. There's that word again; Relative.