Scalar Product in Terms of Component
Just as in the case of vector addition, the scalar product is more feasible in terms of components. First let’s notice that if q=90 degrees, cos q =0, and a•b=0. This condition is certainly met for the unit vectors along the axes, i,j,k. So i•j=0 and i
It can often be used to calculate the angle between two vectors (11)
It can also be used to check if two vectors are perpendicular to each other.