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Friction problem

  1. Aug 8, 2006 #1
    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?
     
    Last edited: Aug 9, 2006
  2. jcsd
  3. Aug 8, 2006 #2

    Office_Shredder

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    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
     
  4. Aug 9, 2006 #3
    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]
     
    Last edited: Aug 9, 2006
  5. Aug 9, 2006 #4
    excuse my bad Latex

    but it should be:

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

    a=-u*g
     
  6. Aug 9, 2006 #5

    daniel_i_l

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    yes thats right!
     
  7. Aug 9, 2006 #6
    thanx 'preciate the help
     
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