the motion described from a particular reference point.
the appearance of motion
??? They could see buildings.
How would passengers on a moving plane be able to tell whether or not they were really moving?
An object may be moving in a different way than it ____ to be or not ____ at all.
What type of motion is the following an example of? Movies - tiny pictures moving repeatedly appear to be smooth motion.
What type of motion is the following an example of? Driver may see a car behind him as moving slow, but someone watching the cars may see that they are going fast.