11. For most surface interfaces, the coefficient of kinetic friction is less than the coefficient of static friction . 12. Static friction is friction between two or more solid objects that are not moving relative to each other.13. :: Your power steering pump is incorrectly producing more static friction of tires when you're stopped. 14. Also, to even calculate either rolling resistance or static friction , one needs a weight for the car. 15. The coefficient of static friction is a derived number, dependent on the limiting friction and the normal force. 16. By balancing forces, you can calculate the frictional force required and therefore the minimum necessary coefficient of static friction . 17. The molecules of the surface exhibit a net positive force against the molecules of the sledge-- static friction . 18. Typically, the static friction coefficient ( a heuristic number ) between two surfaces is larger than the kinetic friction coefficient. 19. A point is reached at which string tension is great enough to overcome the static friction between the string and bow. 20. This angle is equal to the arctangent of the coefficient of static friction " ? " s between the surfaces.
