Speed-dependent friction (IMAGE) Swiss Nanoscience Institute, University of Basel Caption Surprisingly, the friction between the tip of an atomic force microscope and the Moiré superstructures depends on the speed at which the tip is moved across the surface. Credit Department of Physics, University of Basel and Scixel Usage Restrictions The image should only be used when sources are named License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.