Polymer Chain (IMAGE) American Institute of Physics Caption An important component of friction may originate when chains of rubber molecules repeatedly stick to the road, stretch, and then release. Credit Bo Persson, FZ Jülich Usage Restrictions This image may only be used with proper caption and credit. License Licensed 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.