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Acceleration on an incline help please?

  1. Jun 18, 2009 #1
    1. The problem statement, all variables and given/known data
    The question asks, At what angle would the straight need to be inclined at in order for the acceleration of the pod from B to C to be 0m/s^2?
    and if the straight was inclined at 3 degrees calculate the final velocity
    the coefficient of friction is 0.17 the mass is 6000kg the distance is 172m

    2. Relevant equations
    i think my teacher said to use M (coefficient of friction) = tan (theta)
    but i have no idea how to do this :s any help will be greatly appreciated !

    3. The attempt at a solution
    I'm really not sure about any of this at the moment, but if you could point me in the right direction that would be great.

    thanks.

    edit:
    sorry if i'm sounding impatient, but if anyone knows the slightest thing of this could you please lend a helping hand, that would be much appreciated.. this thing is driving me insane lol - if you have a formula i could use or anything :s, if you need more information i probably have it
     
    Last edited: Jun 18, 2009
  2. jcsd
  3. Jun 18, 2009 #2

    Hootenanny

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    Welcome to Physics Forums.

    Could you perhaps provide a diagram, the situation is somewhat unclear?
     
  4. Jun 18, 2009 #3
    Thanks for your reply!

    eisbie.jpg

    there is a image, it's basically a mass travelling down a triangle, i need to find theta/the angle of incline for the mass acceleration to be 0m/s^2
    edit: that thing it's travelling down is 172m long
     
  5. Jun 18, 2009 #4

    Hootenanny

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    Thanks for providing the image.

    If the block is not accelerating, what can you say about the sum of the forces acting on the block?
     
  6. Jun 18, 2009 #5
    well the only forces acting on the block i would imagine would be gravity+friction?

    edit: oh i might have forgotten to mention, the block has already accelerated pretty fast by some magnets.. (4.7gs i calculated) then it's just moving by itself from there on. It's initial velocity is 50.9m/s which i calculated to be 183.24km/h
     
    Last edited: Jun 18, 2009
  7. Jun 18, 2009 #6

    Hootenanny

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    That is indeed correct. If the block is not accelerating, what can you say about the sum of these two forces?
     
  8. Jun 19, 2009 #7
    AH! i get it now... thanks mate, i think that the 2 forces have to be equal, then the tan(theta) of the incline must be my coefficient of friction !
     
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