Friction is responsible for about twenty percent of the world energy consumption. The main reason for this is that frictional forces slow down the motion of surfaces in contact: think of the moving ...

NARRATOR: There’s less friction between the snow and the skis than there was between the road and the skis because snow is a smoother surface? And the less friction there is the easier two objects ...

Perhaps few physical concepts have received less attention relative to their importance than friction. Learning the 'effective' notions of static and sliding friction, students of mechanics can easily ...