Question

if a force is always perpendicular to motion then........?​

Answer 1

Since the change in velocity is always perpendicular to itself, it contributes to change in the direction only. The force supplies the centripetal acceleration. The speed and kinetic energy of the particle remain constant.

Answer 2

Answer:

If the force is always perpendicular to motion, then KE remains constant. So work done is zero. In uniform circulart motion, speed is always a constant but velocity changes as direction changes. ... A force is acting on a body moving along x-axis in the direction of motion of the body