Static Friction

If an object is at rest with respect to a surface, friction will attempt to resist efforts to start the object sliding along the surface. Friction has the goal of keeping the object static with respect to the surface. This static friction is a response force – it provides just enough force to keep the object stationary, and no more. Static friction is characterized by a limiting value. When the net force attempting to create sliding motion exceeds a certain value, static friction will be unable to prevent motion.