Posted by Sybil on Sunday, February 10, 2013 at 2:51pm.
if no one has answered this question yet, that is means the question is difficult. So i will try if i know. I think the answer is 62
The normal force is always perpendicular to the surface. So if the box is on a horizontal surface the Normal force it will be equal to the weith of it (mass *gravity)
N= m*g N=117.6N the friction force always oposses to the movement and it will be equal to the horizontal component of the force that is F Cos 30º
Fr= 20N*Cos 30 = 17.32 N
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