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Coefficient of Friction of a Box of Golf Balls

During my Christmas vacation, I received a box of golf balls from my uncle.  Due to the winter weather, it is not a great time to be golfing, but I still incorporated the golf balls into this forces equation.  I attached a rope to one end of a flat piece of cardboard, placed the box of golf balls on top, then pulled!

I then used the logger pro program to find the acceleration of the box, which was 2m/s^2; found the mass of the box by converting from pounds to kilograms, it was 3kg; and used a protractor to find the angle that the rope was being pulled at, which was 30.  My goal of this was to calculate to coefficient of friction of the box.  The first step in doing this was a free body diagram.
After, I needed to do my net force equations, then solve for the coefficient of friction, which was 0.204N.

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