Question

multiple choice question
a vector whose magnitude is equal to one and whose direction is the same as that of the force f is called the:
o resultant of all forces acting on f.
o unit vector opposite to the direction cosines of f.
o unit vector along the line of action of f.
o resultant of directional sines of f.
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Explanation:

A unit - vector is a vector with magnitude 1. When its direction is the same as that of a force vector F, it is a unit vector along the line of action of F. The other options do not match the definition of a vector with magnitude 1 and the same direction as F.

Answer:

unit vector along the line of action of F.