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@Michele_Laino (when you come online later on)

okay , so do you want me to show you another way to do it? or check your work?

So im assuming it is to tweak the current question to add acceleration

out of interest was does Fnet refer to

|dw:1435246603669:dw|

|dw:1435246874207:dw|

that says Fapp = P

okay right, that is what we are doing

add all the forces

oh actuallly there was something that wasnt considered properly

besides that the equations are same for all forces

N=187.836
Weight is 16.62Kg therefore mg =163.042
u=0.4
P=119.772

let me check what i get

|dw:1435260170676:dw|

sub the values in see if that gives the same answer too

just make sure your signs are right for all of them

Angle=0 (using zero for ease on here) =14.5
pcos0=115.95
mgsin0=40.822
uN=0.4x187.836=75.1344

what do we use for v. is that the acceleration.

@dan815 would you be able to check please.

R is the friction force

which you can solve for P and N

that above is the case without acceleration

but are some of these opposing forces

So, if the vector a is directed at the top of the inclined plane, namely:
|dw:1435262337778:dw|

all those forces are the external forces acting on our box of mass m

@Michele_Laino would you be able to check to see if I have understood what you have done. Sorry about the quality but I will re write it once I know its correct.

what is the value of \theta?

angle is14.5 deg

are your forces measured in Newtons

yes

I also got that answer on the picture I uploaded a few minutes ago

so what you are saying the acceleration speed is 8.45m/sec^2