1. The problem statement, all variables and given/known data One body whit m=50kg is pulled whit a acceleration a=2m/s2 on an horizontal plane whit an unknow force F which is making whit the plane an angle of 30 degree The friction coeficient betwen the body and plane is [tex]\mu[/tex]=0.2.Find the size of the force F. m=50kg a=2m/s2 [tex]\mu[/tex]=0.2 [tex]\alpha[/tex]=30 I need to find the size of force acting on the body http://img11.imageshack.us/img11/7561/61868200.png" [Broken] 2. Relevant equations 3. The attempt at a solution Well i tried to calculate the force whit Newton's formula F=m*a; Then whit force compontents on Ox,Oy Oy:N-G-Fy=0 Ox:Ff-Fx=m*a But my question is "size of force acting on the body" is Fx?!or Fy?!