Mu-Friction
Why I think friction happens is because so that someone or something can stop, without friction the object will probably go on forever. Friction acts a a resisting force to relative motion between two surfaces that are in contact with one another. Another surface that would have a bigger impact on Mu is a concrete surface because its really rough. The concrete will create a lot of friction and will take lots more force to pull the object on a concrete surface
Good example!
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