F.B
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This question is driving me nuts. I really need help with it, actually i just need help setting up my equations.
Mu = the weird friction sympol
A box of a mass m=22 kg is at rest on a ramp inclined at 45 degrees to the horizontal. The coefficient of friction between the box and the ramp are "Mu s" = 0.78 and "Mu k" = 0.65.
a)Determine the magnitude of the largest force that can be applied upward, parallel to the ramp, if the box is to remain at rest.
My equation are:
Fn=Fgy - Fapp
Fnet = 0
also
Fnet = Fgx - Ffs
After that i end up getting two equations for Fapp but when i solve for it i get a negative answer. I also tried flipping Fapp so Fn=Fapp - Fgy but that also won't work, i get the wrong answer.
So can anyone please help get my two equations, there's something wrong with mine.
Mu = the weird friction sympol
A box of a mass m=22 kg is at rest on a ramp inclined at 45 degrees to the horizontal. The coefficient of friction between the box and the ramp are "Mu s" = 0.78 and "Mu k" = 0.65.
a)Determine the magnitude of the largest force that can be applied upward, parallel to the ramp, if the box is to remain at rest.
My equation are:
Fn=Fgy - Fapp
Fnet = 0
also
Fnet = Fgx - Ffs
After that i end up getting two equations for Fapp but when i solve for it i get a negative answer. I also tried flipping Fapp so Fn=Fapp - Fgy but that also won't work, i get the wrong answer.
So can anyone please help get my two equations, there's something wrong with mine.