Why do paper towels and Windex make a squeaky noise when wiping a window? And how come you can change the pitch just by moving a different direction?

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Why do paper towels and Windex make a squeaky noise when wiping a window? And how come you can change the pitch just by moving a different direction?

In: Other

I believe it’s called stick-slip phenomena. There’s a certain amount of friction between the wetted paper towel and the class. When enough pressure is applied it suddenly slips.

Now I’m curious about all things that make noise when rubbed together. Like styrofoam and nails on chalkboard.