___________ is the relative difficulty of moving from one place to another, which increases with miles, cost,?

Question

___________ is the relative difficulty of moving from one place to another, which increases with miles, cost, or travel time.

1. Physical distance

2. Absolute distance

3. Friction of Distance

4. Relative Motion

Answer 1

3.  Friction of Distance

The concept of friction of distance is based on the notion that distance usually requires some amount of effort, money, and/or energy to overcome.  

Because of this "friction," spatial interactions will tend to take place more often over shorter distances; quantity of interaction will decline with distance.