#### notes

**Equal Vectors**

Vectors `barA` and `barB`are said to be equal if `|barA|=|bar B|` as well as their directions are same.

**Zero Vector**

A vector with zero magnitude and an arbitrary direction is called a zero vector. it is represented by `barO` and also known as null vector.

**Negative of a Vector**

The vector whose magnitude is same as that of `bara` but the direction is opposite to that of `bara` is called the negative of `bara` and is written as `-bara`**Parallel Vectors**

`bar A` and `barB` are said to be parallel vectors if they have same direction, and may or may not have magnitude `(barA || barB)`. If the directions are opposite, then `barA` is anti-parallel to `barB`

**Coplanar Vectors**

Vectors are said to be coplanar if they lie in the same plane or they are parallel to the same plane. Otherwise they are said to be non-coplanar vectors.