koi h kya online what is 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. There are several types of friction: Dry friction is a force that opposes the relative lateral motion of two solid surfaces in contact.
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the rubbing of one surface or thing against another
एक वस्तु की सतह का दूसरी से रगड़ खाना; रगड़, घर्षण
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