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Answers. Best Answer: The two objects are neutral to start with because they have an equal number of protons (positively charged) and electrons (negatively charged). When they are rubbed together, some of the electrons from one object are transfered to the other. This means that one object will have more electrons than protons, and thus have a negative charge, while the other will have more protons than electrons, and therefore a positive charge. Source(s):
When an object slides over a rough surface, there is resistance to the motion of the object. The resistance is called kinetic friction. Kinetic friction is a force that the surface exerts on the sliding object. This force is parallel to the surface and directed opposite the direction of motion of the object. In addition to this, the surface exerts a force on the object that is directed perpendicular (normal) to the surface.