1. The problem statement, all variables and given/known data |\ |--\/\ |----\/ |-----\ Given inclined plane with mass M. The angle of inclination is Alpha (from the horizontal plane). The plane has no friction. On the plane block with mass m. The whole system is moving rightwards with acceleration A0. Find the N normal between M and m. 2. Relevant equations m*g*sin(Alpha) + m*A0*cos(Alpha)=m*Ax N + m*A0*sin(Alpha) -m*g*cos(Alpha)=m*Ay 3. The attempt at a solution In those equasions i have 3 variables and only 2 equasions. The Ax and Ay are projections of acceleration of m on the axises. The only thought that comes to mind is to add third equasion as tangent proportion between the Ax / Ay=tan(Alpha) But i have some doubts ... Any suggestions Thank you in advance.