Which of the following describes the way an object moves when an unbalanced force acts upon it?
the object will move in the direction of the force.
the object will not move.
the object will move in the opposite direction of the force.
the object will move back and forth.

What would occur if the index of refraction of a material was less than n=1? the speed of light would increase to a speed larger than the maximum speed of light in a vacuum. the light wave would not bend at all though the material. the light wave would not be able to refract and would instead reflect off of the material. the speed of light would reduce to values close to 0 m/s.