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Theory
an explanation of an aspect of the universe that can be repeatedly tested and corroborated by tests and experiments
precision
refers to how closer measurements of the same item are to each other
accuracy
how close a mesurement is to the true or accepted value
scalar
a number described by only magnitude
vector
a number described by magnitude and direction
distance
a measure of how far something has moved
displacement
a measure of how far something has moved from its starting point
speed
a measure of how fast something is going
velocity
a measure of how fast something is going and in what direction
acceleration
how fast something is speeding up or slowing down