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swin2013
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Forces: You discover that it takes 258.0 N to set a 40.0 kg crate in motion on a concrete surface. What is the coefficient of static friction for the crate?
 2 years ago
 2 years ago
swin2013 Group Title
Forces: You discover that it takes 258.0 N to set a 40.0 kg crate in motion on a concrete surface. What is the coefficient of static friction for the crate?
 2 years ago
 2 years ago

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hubertH Group TitleBest ResponseYou've already chosen the best response.1
@ swin u need to know what plane u are working on is it an incline plane or an horizontal plane/
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
coefficient of static friction=static frictional force/ normal rection
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
I assume the plane is horizontal: the normal reaction=weight=mg ur
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
got it buddy?
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
@hubertH it doesn't say. so i assumed it was horrizontal
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
so u knw how to get to the answer right?
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
but is static friction only involved in inclined plane?
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
No.. then I wouldn't be asking lol
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
No! static friction is the force required to set the body in motion in our case it 's given as 258.0N
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
Well they're asking from the coefficient of static friction?
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
coefficient of static friction=static friction force/normal reaction
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
for horizontal plane normal reaction=mg
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
dw:1351982204492:dw
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
dw:1351982369737:dw
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
do u now have an idea of what u're doing?
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
so i say that Fnet = \[\mu _{s}  Fg = ma?\] a little do you?
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
remember u're given the Fs and the mass only
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
there is no Fa, no Fnet
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
well if it's starting to move wouldn't it be Ff = Mu(s) Fn?
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
\[mus =\frac{ ?Fmus }{Nr ? }\]
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
I have never used Nr in my FBD before?
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
Nr is ur normal reaction=mg
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
Ok so it's just normal force (Fn)
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
so it's Ff/Fn
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
and since it's horizontal Fnet = 0N
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
what is Fnet standing fo?
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
The vector pointing upward
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
Ok i got it, Mu(s) = .66
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
that's it bro congrats and keep on going forwad
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
If they ask for acceleration and give kinetic friction is it still the same equation except it's Mu(k)  Fn = ma?
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
no! kinetic friction is the smallest force that keeps the system moving @ constant speed
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
if u have more questions on science don't hesitate to massage me.....
 2 years ago

swin2013 Group TitleBest ResponseYou've already chosen the best response.1
alright because i have a big physics test and I don't really understand forces lol
 2 years ago

hubertH Group TitleBest ResponseYou've already chosen the best response.1
we'll try to make it easier together bye for now
 2 years ago
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