Fig. 4
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(a) Experimental data of the height of a corner of the nut during one rotation of the nut extracted using Tracker (software). A sinusoidal fit is performed on the experimental data and plotted in solid line. (b) Superposition of three images of the nut rolling on the membrane taken with a high-speed camera at 3000 fps. For visualisation purposes the hex nut is redrawn.
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