1. The problem statement, all variables and given/known data we want to move an object with mass m=100kg which is still on a rough surface with a force F=800N. between the surface and the object there's a [tex]\mu_s=1[/tex]. Prove that the object can be moved if the force is applied with a 30° angle with the surface. 2. Relevant equations F=m*a (N's 2nd law) 3. The attempt at a solution friction: A=-mu *N=-100*10=-1000N F_rx=m*a_x ==> a_x=(-mu*N + F*cos30°)/m=-3.07 m/(s*s) F_ry=m*a_y ==> a_y=(F*sin30)/m=4 F_r=sqrt( F_rx^2 +F_ry^2) But I get that A>F_r (result of all forces) so the body doesn't move. Where am I wrong?