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Mathematics (Maths) Class 12

JEE : Doc: Types of Vectors JEE Notes | EduRev

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A vector has direction and magnitude both but scalar has only magnitude.

Magnitude of a vector a is denoted by |a| or a. It is non-negative scalar.

Equality of Vectors

Two vectors a and b are said to be equal written as a = b, if they have (i) same length (ii) the same or parallel support and (iii) the same sense.

Types of Vectors

(i) Zero or Null Vector A vector whose initial and terminal points are coincident is called zero or null vector. It is denoted by 0.

(ii) Unit Vector A vector whose magnitude is unity is called a unit vector which is denoted by nˆ

(iii) Free Vectors If the initial point of a vector is not specified, then it is said to be a free vector.

(iv) Negative of a Vector A vector having the same magnitude as that of a given vector a and the direction opposite to that of a is called the negative of a and it is denoted by —a.

(v) Like and Unlike Vectors Vectors are said to be like when they have the same direction and unlike when they have opposite direction.

(vi) Collinear or Parallel Vectors Vectors having the same or parallel supports are called collinear vectors.

(vii) Coinitial Vectors Vectors having same initial point are called coinitial vectors.

(viii) Coterminous Vectors Vectors having the same terminal point are called coterminous vectors.

(ix) Localized Vectors A vector which is drawn parallel to a given vector through a specified point in space is called localized vector.

(x) Coplanar Vectors A system of vectors is said to be coplanar, if their supports are parallel to the same plane. Otherwise they are called non-coplanar vectors.

(xi) Reciprocal of a Vector A vector having the same direction as that of a given vector but magnitude equal to the reciprocal of the given vector is known as the reciprocal of a.

i.e., if |a| = a, then |a-1| = 1 / a.

Example 1
In the figure given below, identify Collinear, Equal and Coinitial vectors:
Doc: Types of Vectors JEE Notes | EduRev

Solution: By definition, we know that

  • Collinear vectors are two or more vectors parallel to the same line irrespective of their magnitudes and direction. Hence, in the given figure, the following vectors are collinear: Doc: Types of Vectors JEE Notes | EduRev
  • Equal vectors have the same magnitudes and direction regardless of their initial points. Hence, in the given figure, the following vectors are equal: Doc: Types of Vectors JEE Notes | EduRev
  • Coinitial vectors are two or more vectors having the same initial point. Hence, in the given figure, the following vectors are coinitial: Doc: Types of Vectors JEE Notes | EduRev

More Solved Examples
Question: In the given figure, identify the following vectors

  1. Coinitial
  2. Equal
  3. Collinear but not equal

Doc: Types of Vectors JEE Notes | EduRev

Solution:

  • Coinitial vectors have the same initial point. In the figure given above, vectors Doc: Types of Vectors JEE Notes | EduRev  are the two vectors which have the same initial point P.
  • Equal vectors have same magnitudes and direction. In the figure given above, vectors Doc: Types of Vectors JEE Notes | EduRev are equal vectors. 
  • Collinear vectors are two or more vectors parallel to the same line. In the figure given above, vectors  Doc: Types of Vectors JEE Notes | EduRevare parallel and hence, collinear. Also,  vectors Doc: Types of Vectors JEE Notes | EduRev are parallel and hence, collinear. We know that vectors Doc: Types of Vectors JEE Notes | EduRev are also equal. Hence, vectors Doc: Types of Vectors JEE Notes | EduRevare collinear but not equal.
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