1. The problem statement, all variables and given/known data I'm attaching a picture for the problem. 2. Relevant equations F - N - K(that's my problem) = Ma K = m2a2 N = m1a (the acceleration is the same, since the rolling body pushes the m1 body forward) m1g - K = m1a1 (this is the acceleration in the y direction) a2 = a + a1 (this is obvious) 3. The attempt at a solution Well I know how to solve it now(since I know the force diagram). I just don't know how that K tension force started to act on the rolling body. BTW! If you know similiar force problems I would really, really love you for it. Imho this is pretty complex, I was wondering about non-calculus based, very complex force problems, examples so I can prepare. Thanks!