Practice portal › Motion in a Plane › Vector Addition and the Resultant
Asked in NEET 1997 · Scalars, vectors and unit vectors
Idea: a vector needs both a magnitude and a direction, and must add by the triangle rule rather than by ordinary arithmetic.
Distance is a path length, so it carries no direction.
Heat and energy are both measured by a single number and add arithmetically.
Angular momentum is L⃗=r⃗×p⃗, a cross product, so it has a definite direction along the axis of rotation.
Angular momentum is therefore the vector quantity.
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