Question

why static force is less than rolling friction

Answer 1

static friction means non moveable object. eg. a pile of book
rolling friction means a object which help to move an object with wheels. eg. a rolling chair
thus rolling friction help a lot and need less force
hope it will help u

Answer 2

The kinetic friction is usually not greater than the applied force. You start moving an object which increases the static force to prevent any motion. However, you keep applying more force until you reach a maximum value for the static friction. ... This friction must be overcome by energy to move the object.