The amount of friction depends on the fluid viscosity and the velocity gradient (that is, the relative velocity between fluid layers). The velocity gradients are set up by the no-slip condition at the ...

Similarly, when atomic layers of certain materials are slightly misaligned, their atoms fail to synchronize, and friction between them nearly disappears. About 20 years ago, scientists discovered ...

This friction is associated with the development of boundary layers, and it scales with Reynolds number as we have seen above. Pressure drag comes from the eddying motions that are set up in the fluid ...

A recent article published in Advanced Functional Materials investigated the friction behavior of surfaces coated with surface-attached hydrogel layers. These natural synovial-joint structure-inspired ...

Ice causes very little friction, which is why it is easy to slip over on an icy day. However, this is a good thing for ice skating and sledging. Friction is a force between two surfaces that are ...