Question

Why does the static friction have greater value than the kinetic friction

Answer 1

Static friction have greater value than the kinetic friction because static friction acts when the body is at rest. and there is much more inter molecular attraction between the object and the surface for a long time which is required to be overcome first. Whereas in kinetic friction one object is in moving condition. The contact of the object with the surface is for a short time duration and have a less inter molecular attraction between them. As a result, only a less force is needed to move a moving object than the static object.