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Molecular movement in a traveling wave are perpendicular to the direction of the wave. This means that water molecules go up and down as the wave moves across the surface. So water motion itself would not move the ball. I can think of two mechanisms that would move the ball in the direction the wave is moving.1) As the ball is raised up on the slanted surface of the wave front it will tend to slide downhill a little in the direction of the wave. This means that it takes a little longer for the wave to pass under the ball and there is more time for it to slide down. On the backside of the wave the ball would tend to slide in the direction opposite wave motion but it wouldn't make up for the movement on the front side of the wave because movement backward reduces the time it is on the rear wave face.2) The moving wave fronts might act as paddles that could create air movement near the water surface in the direction of the waves. This could blow the ball across the surface a little in the direction of the waves.I don't know how wave period and amplitude would affect these mechanisms.