velocity dependence (IMAGE) Vienna University of Technology Caption Slow sliding speed (left) leaves the structur of the metal intact. Fast sliding (middle) completely destroys it. Extremely fast sliding (right) partly melts the uppermost layer, but this effect protects the layers below. Credit TU Wien Usage Restrictions none 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.