I believe its the law of inertia
The frequency of the wave is 4 Hz
Friction force is when you rub 2 things together and they get warm. Motion, on the other hand, is if your walking along the sidewalk - you hardly get warmer -------
Unless it's a colder day outside and you're walking SO you decide to rub your hands together to get warm, but if you were just walking , its motion and only motion - no friction :):)
The lithosphere because it includes the outer region of the earth including the crust and outer mantle