Question

this is a physics question that im confused on and nobody in the physics subject will help me so im just trying you guys... but .
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

Answer 1

resistance that one surface or object encounters when moving over another

Answer 2

b? but thats two surfaces. and thats why im confused

Answer 3

@megen505 : Please don't post physics problems in Mathematics section.
I understand that no one was helping you there but eventually you'll be rescued. :)

And regarding your question, i also think it's B.