on can be described using words, diagrams, numerical information, equations, and graphs. Using
words to describe the motion of objects involves an understanding of such concepts as position,
displacement, distance, rate, speed, velocity, and acceleration.
Vectors vs. Scalars
1. Most of the quantities used to describe motion can be categorized as either vectors or scalars. A
vector is a quantity that is fully described by both magnitude and direction. A scalar is a quantity that is
fully described by magnitude alone. Categorize the following quantities by placing them under one of
the two column headings.
displacement, distance, speed, velocity, acceleration
Scalars
2. A quantity that is ignorant of direction is referred to as a
a. scalar quantity b. vector quantity
3. A quantity that is conscious of direction is referred to as a
a. scalar quantity b. vector quantity
Vectors
Distance vs. Displacement
As an object moves, its location undergoes change. There are two quantities that are used to describe
the changing location. One quantity - distance - accumulates the amount of total change of location
over the course of a motion. Distance is the amount of ground that is covered. The second quantity -
displacement - only concerns itself with the initial and final position of the object. Displacement is
the overall change in position of the object from start to finish and does not concern itself with the
accumulation of distance traveled during the path from start to finish.
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