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Physics

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cultrara
Posts: 5147 - Karma: 46,851

a skier with an initial speed of 7.6 m/s is gliding across the snow. no air resistance. the kinetic friction is .1

find the deceleration caused by friction

this is all the question gave me. i if i knew the skiers wieght i could solve it. +k for help

Dec 1 2010 8:18PM
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vandersteeze
Posts: 2650 - Karma: 1,511
Wtf the function is Ffriction = Fn * uk

Without the normal force your fucked
Dec 1 2010 8:19PM
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vandersteeze
Posts: 2650 - Karma: 1,511
Ohhhh sheeiiit I got it



afric = m/F and Ffric = m * uk

so when you plug Ffric into the afric equation mass cancels out. Your all good mang!
Dec 1 2010 8:23PM
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scott-skis
Posts: 1161 - Karma: 141
ya, i'm pretty sure that's unsolvable..?
Dec 1 2010 8:23PM
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sklermang
Posts: 2981 - Karma: 1,953

a skier with an initial speed of 7.6 m/s is gliding across the snow. no air resistance. the kinetic friction is .1

find the deceleration caused by friction

f=N*.1

Fy=N - mg = 0

N = mg

Fx=f

Fnet= ma

mg*.1=ma

.1g= a

.1(9.8)=a

.98m/s^2 = a

Dec 1 2010 8:24PM
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vandersteeze
Posts: 2650 - Karma: 1,511
so your acceleration is 1/.1 = 10 m/s^2
Dec 1 2010 8:24PM
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vandersteeze
Posts: 2650 - Karma: 1,511
^ I mean deceleration
Dec 1 2010 8:25PM
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sklermang
Posts: 2981 - Karma: 1,953
PS youre welcome
Dec 1 2010 8:25PM
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vandersteeze
Posts: 2650 - Karma: 1,511
lol your wrong
Dec 1 2010 8:25PM
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vandersteeze
Posts: 2650 - Karma: 1,511
wait fuck your right
Dec 1 2010 8:29PM
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Stickity
Posts: 7750 - Karma: 769
hahahahahahahahahahahahah
Dec 1 2010 8:29PM
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cultrara
Posts: 5147 - Karma: 46,851
i got it, but thanks guys.     you need to use the formula     a = ug     (u is the coeficent of the friction)
Dec 1 2010 8:36PM
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vandersteeze
Posts: 2650 - Karma: 1,511
Yeah nostrebor just derived that formula. I just put down a bunch of retarded shit that inst correct
Dec 1 2010 8:41PM
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cultrara
Posts: 5147 - Karma: 46,851
yeah to bad i didnt understand either of you haha but +k for the help/effort
Dec 1 2010 9:09PM
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