Homework Help: Acceleration on an incline help please?

1. Jun 18, 2009

quirty1

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. Jun 18, 2009

Hootenanny

Staff Emeritus
Welcome to Physics Forums.

Could you perhaps provide a diagram, the situation is somewhat unclear?

3. Jun 18, 2009

quirty1

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

4. Jun 18, 2009

Hootenanny

Staff Emeritus
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?

5. Jun 18, 2009

quirty1

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
6. Jun 18, 2009

Hootenanny

Staff Emeritus
That is indeed correct. If the block is not accelerating, what can you say about the sum of these two forces?

7. Jun 19, 2009

quirty1

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 !