Explore how forces and friction work to hold a block against a vertical wall. This video explains normal force, frictional force, and equilibrium conditions, showing how these forces balance to ...

How much do you know about friction? Jennifer R. Vail's charming, if sometimes technical, "biography" of the force showcases its amazing and largely overlooked role in everything from climate change ...

Humans have been making fire by friction for centuries, but it's not easy. Cyndi Monaghan/Moment via Getty Images Fire by friction is a testament to human ingenuity, contributing to the development of ...

In this video, we explain the capstan equation and how friction affects a rope or string wrapped around a surface. You’ll learn where the equation comes from, what each term means, and how it’s ...

In "Friction," tribologist Jennifer Vail shows how the fundamental force that resists motion keeps driving us forward.