Water is attached to the dog by surface tension, they thought, and the sinusoidal shaking creates centripetal forces that ejects that water off the body.
他们认为水沾在身上靠的是身体表面的亲和力，正弦波状的抖动动作制造了水脱离身体的离心力。
2
So for the water to be ejected from the fur, the centripetal force has to exceed the surface tension.