As the disk slips, there is a friction force acting to the left on the disk at the contact point. During slipping, the friction force opposes the direction of motion of the contact point – that is, ...

Friction is a force that opposes motion when two materials slide over one another—a skydiver will reach terminal velocity due to air friction balancing the force of gravity; a car will come to a ...

Although humans have been harnessing its power since rubbing two sticks together to build the first fire, the physics of friction remain largely in the dark. Now, Brandeis research is showing that ...

Here we present nanoscale friction force microscopy (FFM) experiments for a nanoscale probe tip sliding on a chemically modified graphite surface in an atomic force microscope (AFM). Our results ...