Transverse wave motion happens when particles move perpendicular to the wave's direction. Think of shaking a rope up and down. In Grandpa’s case, moving the spring side to side (like a transverse wave) helps it slide smoothly through the pipe, reducing friction. A smart and simple use of physics. . Credit: unknown All rights and credits reserved to the respective owners. This video is for educational purposes only. Dm for Removal . I promise you won't regret following us @explaining.astrophysics