In static friction, the frictional force is whatever value it needs to be to prevent sliding up to some maximum value. Technically, this is called Amontons' First and Second Law of Friction.

If the magnitude of your pushing force was 1 newton, then the frictional force would also have to have a magnitude of 1 newton. The horizontal forces have to add up to zero newtons, since the book ...

Work is also done when a force causes an object to move. When work is done against frictional forces acting on an object, the object's temperature increases. For example, a person's hands warm up ...