Edmund Rappley: for any object, its surroundings is considered as the frame of reference.for example, if you're sitting in a moving train, you're at rest if the frame of reference was the train but you're in motion if the frame of reference is the city outside.
Luke Creitz: they are like a number line with numeric values.. with 0 in the middle-3 -2 -1 0 1 2 3 used to show the location of somethingi could reply better normally but I'm feelin' weird....Show more
Kip Ockenfels: sophisticated situation. research with bing and yahoo. this can assist!
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