Question

a vector has no effect in perpendicular direction? explain

Answer 1

Notice that vector a has no effect in the direction of vector b, and similarly, vector b has no effect in the direction of vector a. When two vectors are perpendicular to each other, it is said that they act independently of each other.

Answer 2

Answer:

Explanation:

Work is proportional to the scalar product of force and line element. Hence any forces acting perpendicular to the path will not contribute to the work.

Perpendicular forces do not change the magnitude of velocity (it only effects the  direction). Also the perpendicular force should not enter into the equation of work (since it does not effect to the energy change).