Hi all. I am new to this forum but I've finally got here where this is a sub-forum with a title the most appropriate to my question.
I'd like to have some general and conceptual idea about wear of materials.
Theoretically, is it true that when two objects of any kind collide, rub, slide or a just soft touch/contact, there should be some wear on the microscopic level (even if it's a very small extent that we won't notice) ?
When an object gets wear for its first time, will it still keep wearing (either quickly or slowly) in the air even without other factors that keep it wear?
i.e. two identical objects put under the same environmental conditions but one of them got collided or a hammering, which may lead to some wear. After that, both of them are kept stationary without any collision, would the one once get wear keep wearing in the air at a little bit higher rate than the one never got wear?