Extreme Snowboarding is a form of Freeride snowboarding that is carried out in extreme terrain, typically containing obstacles such as cliffs, ravines, deep snow, rock gaps and anything else that occurs in a mountain environment.
Every year there is a competition in Alaska called King of the Hill, where extreme snowboarders compete for cash prizes.
... evasive action towards the externally applied force will cause one end of the axis to push against the upper rim of the groove, while the other end of the axis pushes ...