Athiests; a question.

[imported_luckyme]

[ QUOTE ]
(A) The first ball has transferred something to the other, (B) yet nothing has been moved."

[/ QUOTE ]

Your professor was screwing with your head. He has to make up his mind. Is the force something, or nothing. in A he's treating the force as different from nothing, referring to it directly as something. In B he's constricting 'something' to those entities having mass, and now claiming the force therefore = nothing.
Was he tenured?

I'm being such a pickass because the meaning of 'exist' underlies the OPs claims and questions. It needs sorting out.