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Introduction to Vectors

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Physics is...
... the natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force.
direct line segment
a line segment in which the endpoints are designated in a definite order.
a displacement distinguished by magnitude and direction but not by location.
zero vector
a vector of length zero.
initial point
the point at the tail of a vector.
terminal point
the point at the head of a vector.
... of a vector is always a positive quantity