Probably everyone is familiar with the phenomenon: water drops cling to a pane of glass, if it is tilted out of the horizontal plane. Only when a certain angle is reached they slide off. This raises ...

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 ...

Delving into history books, we can learn that already thousands of years ago the Egyptians realized that lubricants like water and oil helped reduce the friction of sledges that moved the heavy stones ...

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 ...

Show that static friction is greater than kinetic friction by pulling on a wooden box using a spring scale. Clamp the board to a table. (Optional) Select the 50 N scale on the force probe and connect ...

MOST methods of measuring kinetic friction merely record the average force necessary to maintain sliding. On theoretical grounds, and from the results of some earlier more primitive experiments, it ...

Similar to the way pavement, softened by a hot sun, will slow down a car, graphene slows down an object sliding across its surface. But stack the sheets and graphene gets more slippery, say theorists ...

For the first time, ETH Zurich Materials Scientists have measured the rolling friction of microscopic, micrometer-sized particles. These measures allow them to better understand common items like ...