A physical quantity that has both magnitude and direction.
Examples: displacement, velocity, momentum, acceleration
A vector is represented by an straight line over a physical quantity.
The length of the line may indicate the magnitude of the vector and it’s direction by the arrow mark.
The magnitude may be zero. The magnitude is the modulus of the vector, a positive number. The modulus of a vector is the measure of it’s magnitude.
The modulus of a vector V is represented as .
A vector from point A to point B is denoted by .