generally confirm the existence of a non-contact friction force between surfaces separated by very small distances. What's behind it? As with many mysteries of physics, this one seems to have ...

Science presenter Jon Chase explains friction. He describes how friction opposes or prevents motion, and demonstrates the force in action with an experiment involving two interleaved books.

They have limits, and the capstan equation is fundamental to understanding your biggest challenge when it comes to their design: friction. Wouldn’t it be neat if we could control anything ...