Unit vector n^ is along______________?
Correct answer: B. Normal on a surface
- A. X-axis
- B. Normal on a surface
- C. Y-axis
- D. Z-axis
Explanation
The symbol n^ usually represents a unit normal vector, so it points perpendicular to a surface. A unit vector can point along any direction, not only an axis. Students may choose an axis because unit vectors such as i, j and k are commonly associated with the X, Y and Z axes.
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About Addition of Vectors
Vector addition combines directed quantities using the head-to-tail, parallelogram and component methods. Work includes finding the resultant magnitude and direction for two or more vectors, resolving vectors into perpendicular components, and distinguishing vector addition from scalar addition, where direction has no role.
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