what is friction what are microscopec basis of friction? what is normal force how it affects friction?
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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other
Viewed under a microscope, a surface generally looks rather rough, with hills and valleys. When you put two surfaces together, they actually make contact at very few places. When trying to move surfaces past each other, the high parts on each surface get stuck on one another.
F = Mu x mg where Mu is the coefficient of friction. As weight increases , friction increases. In case of body on horizontal plane , Normal force N = mg. So friction in this case is directly proportional to the normal force.
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