Friction depend on what three (3) condition
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a) The materials that are in contact. The two materials and the nature of their surfaces. ...
b) The force pushing the two surfaces together. Pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other.
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Explanation:this co efficient depends on what the two surfaces are ( materials, roughness,presence or absence of lubricants,type of friction ( static,rollin etc...) And after also the speed of motion between the surface etc...
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