![]() ![]() About SkySci for Kids Information about this website for parents, caregivers, and educators. Clouds and Raindrops Thunderstorms Audio. It moves waves of all sizes at the same speed which may overpower the rippling effect due to the surface force. This video is a part of Animated Atmosphere, a suite of short videos produced by the UCAR Center for Science Education with FableVision Studios. Here, the raindrop hits the water, but the force due to gravity becomes more important. Imagine that rain is hitting a lake or ocean – or those deep pothole puddles that require galoshes. Raindrops may react differently in other situations. This creates the enchanting pattern that we see. For shallow puddles, the long waves move slowly away from the point of impact, while the short waves move fast, and the really short waves move really fast, becoming tightly packed at the perimeter. The surface force is different for long waves than for short ones, causing waves of different sizes to separate into ripples. ![]() This is key, since the surface force depends on the curvature of the water surface, whereas the gravitational force does not.Īn initially still shallow puddle becomes curved at the surface after the raindrop hits. The balance between the surface force – between the water puddle and the air above it – and the gravitational force tips in favor of surface force. ![]() Shallow puddles enable ripples, because they are much thinner than they are wide. Large waves in the center move more slowly than small waves at the perimeter. The initial wave bundle caused by the raindrop splits into waves of different sizes. A model of waves in a dispersive puddle, after a raindrop hits. ![]()
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