Materials scientists are measuring the rolling friction of tiny, micrometer-sized particles. These measurements permit them to better understand everyday products such as concrete. For the first time, ...

1.1 What is friction? Take this everyday example: when a coffee mug rests on a flat table, the kinetic frictional force is zero. There is no force trying to move the mug across the table, so there is ...

During commercial flat rolling of steel and aluminium strips control of the coefficient of friction at the roll/work piece contact is achieved by careful choice of the lubricant. The choice also ...

Friction exists because most surfaces really look like this under a microscope. Note the hills, the crests and the valleys. These are called asperities, or material deformations. They occur on rough ...