alleryStart learning →In one-dimensional motion, how is the direction of a vector usually indicated?
ABy writing the angle it makes with the axis
BBy stating the magnitude in SI base units
CBy giving the quantity a plus or a minus sign
DBy marking the quantity with a bar above it
Answer & Solution
Correct answer: C. By giving the quantity a plus or a minus sign
1. Motion in one dimension has only two possible directions along the line.
2. The direction of a vector is therefore given simply by a plus or a minus sign.
3. Angles are needed only once motion leaves a single straight line.
4. A bar above a symbol marks an average value, not a direction.
_Source: OpenStax College Physics (CC BY 4.0), Ch 2 "Kinematics", section 2.2 Vectors, Scalars, and Coordinate Systems_
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