Three examples are given below. Molecules Will be Attracted to Each Other I. Molecules form dipoles where one side of the molecule is positive and the other side is negative. A. Nonpolar molecules form temporary dipoles when electrons temporarily redistribute themselves to one side of the molecule due to random motion or the influence of nearby charges. B. Polar molecules have a permanent redistribution of electrons to one side of the molecule due to the uneven ability of different atoms to attract electrons. Dipoles will orient themselves so that opposite charges are near each other.
Opposite charges form attractive forces.
A ball whirled at the end of a string will go in a direction tangent to the circle when let go. I. An object will go in a straight line when there is no outside force acting upon it. Straight line motion for a whirling ball is tangent to the circle. A. Straight line motion for a whirling ball is perpendicular to the radius of the circular motion. B. Perpendicular to the radius of the circular motion is tangent to the circle.