Oran uses a ball, a bar magnet, and a compass to create a model of earth’s magnetic field. how could he best use these materials? he could glue the compass to the ball so the needle points to the top of the ball, and move the bar magnet to show how the compass direction changes. he could glue the compass to the ball so the needle points to the bottom of the ball, and move the bar magnet to show how the compass direction changes. he could place the bar magnet in the ball so that the north pole of the magnet is at the top of the ball and the compass needle points to it. he could place the bar magnet in the ball so that the south pole of the magnet is at the top of the ball and the compass needle points to it.

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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.