Finding Applied force given Mass and Kinetic and Static coefficients.

[Hieroglyphics]

Homework Statement

Your family just had anew refrigerator delivered. The delivery man has left and you realize that the refrigerator is not quite in the right position, so you plan to move it several centimeters. If the refrigerator has a mass of 180 kg, the coefficient of kinetic friction between the bottom of the refrigerator of the floor is 0.13, and the static coefficient of friction between these same surfaces is 0.21, how hard do you have to push horizontally to get the refrigerator to start moving?

Homework Equations

The one's I'm thinking of are:
Fnet = ma
Fnµ = Ff

The Attempt at a Solution

So I found the Normal Force and Force of Gravity are 1764 obviously

Force of kinetic friction is 229.32, force of static friction is 370.44
and I think I can do 370.44-229.32 = Fnetx so that Fnetx = 141.12
so then I would know ma = 141.12 so a = .784.

But I'm stuck after that :(

 

[PhanthomJay]

Homework Statement

Your family just had anew refrigerator delivered. The delivery man has left and you realize that the refrigerator is not quite in the right position, so you plan to move it several centimeters. If the refrigerator has a mass of 180 kg, the coefficient of kinetic friction between the bottom of the refrigerator of the floor is 0.13, and the static coefficient of friction between these same surfaces is 0.21, how hard do you have to push horizontally to get the refrigerator to start moving?

Homework Equations

The one's I'm thinking of are:
Fnet = ma
Fnµ = Ff

The Attempt at a Solution

So I found the Normal Force and Force of Gravity are 1764 obviously

Force of kinetic friction is 229.32, force of static friction is 370.44
and I think I can do 370.44-229.32 = Fnetx so that Fnetx = 141.12
so then I would know ma = 141.12 so a = .784.

But I'm stuck after that :(

You cannot have static friction and kinetic friction acting at the same time. Static friction acts only when the object is not moving with respect to the surface it is in contact with, and kinetic friction acts only when the object is moving with respect to the surface it is in contact with. Just before the refrigerator starts moving, which type friction force applies? Is there any acceleration of the refrigerator before it starts to move? What force must be applied at the instant just before it starts to move?