Introduction Have you ever seen video footage of an avalanche or landslide rolling down a hill? Why is it that at one moment everything seems fine then suddenly the mountain begins to slump? This ...

To measure the coefficient of static friction, change the angle on a ramp until a small wooden box slides downslope. One can change the contact surface to metal, add moisture, and change the weight of ...

A heap is created when a powder is poured onto a surface. It is widely known that both the heap shape and the repose angle strongly rely on grain properties. Specifically, a non-cohesive powder forms ...