Deformation of a graphene layer during sliding by out-of-plane wrinkling or puckering has previously been linked to increased friction in nanoscale contacts 6. The negative coefficient of friction in ...

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Friction is a force that exists when two surfaces rub up against each other. For example, this cup on ...

Watch this video to learn more about friction. Find out about different types of friction and how we can increase or reduce it. Friction is a force between two surfaces rubbing against each other. If ...