Describing motion

is a place or object used to determine if something is in motion.

if an objects position changes relative to another object.

a place we refer to when determining if an object is accelerating.

if it is vibrating.

if the objects beside it move relative to it

if its position changes relative to another object

to describe velocity

to describe motion

is a length of a path between two points

to calculate acceleration.

to know if an object is moving.

to describe motion completely.