friction problem


by ksle82
Tags: friction
ksle82
ksle82 is offline
#1
Aug8-06, 11:55 PM
P: 38
A car travelling at an initial velocity [tex]v_{0}[/tex] applies its brakes to come to a stop. The coeffictien of friction is [tex]\mu[/tex]. What distance is required to stop?

I know that you can solve for x using this equation:
[tex]v^2=v_{0}^2+2ax[/tex]

-but i don't know how to solve for acceleration a. any help?
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Office_Shredder
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#2
Aug8-06, 11:58 PM
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P: 4,499
Can you calculate the frictional force? If so, can you calculate the acceleration, by, say, using the definition of force? Try it out, assigning the mass to be m0, and see what you get
ksle82
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#3
Aug9-06, 12:10 AM
P: 38
Im trying to do a force balace to find a but im not sure this is right.

[tex]-\mum_{0}g=m_{0}a[/tex]
solving for for a, i get [tex]a=\mug[/tex]

ksle82
ksle82 is offline
#4
Aug9-06, 12:13 AM
P: 38

friction problem


excuse my bad Latex

but it should be:

-u*Mo*g=Mo*a, solving for a,

a=-u*g
daniel_i_l
daniel_i_l is offline
#5
Aug9-06, 04:49 AM
PF Gold
daniel_i_l's Avatar
P: 867
yes thats right!
ksle82
ksle82 is offline
#6
Aug9-06, 02:28 PM
P: 38
thanx 'preciate the help


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