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 ...

Of course, the study of friction is nothing new; and to explain the 20th-century crisis, and to understand where tribology may yet take us, we must first understand how we got here. So begins Vail’s ...

In this video, we break down the concept of the coefficient of friction in AP Physics 1, explaining how static and kinetic friction work and how they affect motion. Clear examples and reasoning help ...

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