An experiment on the formation of "washboard road" ripples. Here there is no wheel or suspension, just a flat plow blade that is dragged over the surface of dry sand. The sand "road" is on the circumference of a rotating table, and the plow support is fixed in the lab frame. This is a stroboscopic movie made of images taken once every table rotation, so the table appears fixed. The ripples move "down the road" (i..e. in the driving direction) which is opposite to the rotation of the table.
Movie by Jim N McElwaine, DAMTP Cambridge with Nicolas Taberlet, Anne Florence Bitbol and Stephen Morris.
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