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hastings
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Homework Statement
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.
Homework Equations
F=m*a (N's 2nd law)
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?