# Need help forming an equation of acceleration w/ friction

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I have drawn my diagrams and summed forces, but i need help forming the equation. thanks for your help!!

A force of 380 N pushes a 52 kg object.  Find the acceleration of the box if the force makes an angle of 70 degrees from the vertical (the force is pushing down on the box).  The coefficient of kinetic friction is 0.4.

asked Oct 3, 2014 in General

On vertical direction (y) forces are balanced $mg+Fcos70^\circ =N$.
On horizontal, find the net force which is the sum of the x component of F and f:  $F_{net}=Fsin70^\circ-\mu N=ma$.