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1st what are the two interacting objects in the system? Calebs finger and Emma's finger. Anything outside of these two things are not in the discussed system.
2nd at all points where they are in contact the force of Calebs finger on Emmas finger is equal (but in the opposite direction to)...
The 50N force on that same object will cause it to accelerate. Draw the force diagram. The 30N friction force will be the same as long as the object and surface remain the same. Fk= N×(Coef of kinetic friction). In order to have constant velocity your applied force must be exactly 30N no...