Your friend is very skeptical of this whole relativity thing, and points out that they have never experienced crazy things like time slowing down, and frankly galilean relativity seems to work just fine. what could you say to your friend to explain why they haven't observed the effects of special relativity?

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

A. they hold atoms  together with a molecule.its a force that exist between molecules. hope this .