Question

1. Why is friction associated with static electricity?

Answer 1

It’s not technically friction (friction being friction force) that causes static electricity. The cause, more correctly, is the adhesive forces between the atoms’ electrons and protons. By adhesive forces, I’m referring to the attraction between positive protons and negative electrons.

When you rub 2 objects together, one of those objects may tend to attract electrons more strongly, despite both being neutrally charged. So, when you rub them together, one of those objects will attract more electrons to their side. Then when you separate them, those electrons stay on that side. Thus, you get one object that has more electrons (i.e.negatively charged), and one object with less electrons (i.e. positively charged). And boom, static electricity.

What is Adhesive force :-

A force called the adhesive molecular force holds materials together. But when two different materials are pressed together and then pulled apart, the adhesive molecular force pulls electrons from one material and deposits unto the other. This creates the separation of charges or static electricity.

Although your can create static electricity by pressing materials together and pulling them apart, rubbing them together usually works even better.

One unfortunate result from saying that rubbing materials creates static electricity is that most people think that friction causes the charges to build up. It is not friction that causes static electricity, rather it is the adhesive forces that pull off electrons.

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