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

Question

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

anonymous · Answer

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.

anonymous · Answer

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.

anonymous · Answer

resistance to motion by two surfaces in contact