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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):
The force of friction. The normal force is one component of the contact force between two objects, acting perpendicular to their interface. The frictional force is the other component; it is in a direction parallel to the plane of the interface between objects. Friction always acts to oppose any relative motion between surfaces. For the simple example of a book resting on a flat table, the frictional force is zero.