* Motion is relative: An object's motion depends on the chosen reference point. If you're on a train moving at 60 mph, you might see a person walking down the aisle at 3 mph. From your perspective, they are moving. However, from the perspective of someone standing outside the train, they are moving at 63 mph.

* Distance is not the only factor: Even if an object's distance from a reference point *doesn't change*, it could still be in motion. Imagine a car driving in a perfect circle around a point. The car's distance from the center of the circle remains constant, but the car is clearly in motion.

To truly determine if an object is in motion, you need to consider:

* Change in position: Is the object changing its location relative to a reference point?

* Change in time: Is the change in position happening over a period of time?