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OpenStudy (anonymous):

What is friction? the wearing down of surfaces resistance to motion of two surfaces in contact mutual irritation the generation of heat by rubbing hands together

OpenStudy (anonymous):

not the wearing down of surfaces. That would be errosion. Not mutual irritation. Not the generation of heat by rubbing hands together. So it is resistance to motion of two surfaces in contact.

OpenStudy (anonymous):

the generation of heat by rubbing hands together is *because* of friction. But that option is not the correct answer because it is not the definition of friction.

OpenStudy (anonymous):

resistance to motion by two surfaces in contact

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