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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 there is relative motion between two surfaces, there is a resistance to the motion. This force is called friction. Friction is the reason why people could not accept Newton's first law of Motion, that an object tends to keep its state of motion. Friction acts opposite to the direction of the original force. The frictional force is equal to the frictional coefficient times the normal force.