In winter, when you comb your hair with a plastic comb, it will float with the comb, which is a _ _ _ _ _ phenomenon. The more you comb, the more fluffy your hair will be. The reason is that

In dry weather, when combing hair with a plastic comb, the comb rubs against the hair, resulting in triboelectrification. The comb and the hair are charged with different kinds of charges, which attract each other, so the hair will float with the comb. This phenomenon belongs to triboelectrification. Hair has the same charge, and the same charges repel each other, which leads to the fluffy hair. This is a phenomenon related to static electricity. When the comb that has been combed over is close to the positively charged glass rod, it is found that the two attract each other, so the plastic comb is negatively charged and the hair is positively charged.

Therefore, the answer is: friction electrification; The same charges repel each other; Negative; Positive.