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Motion and friction problem

  1. Jun 12, 2007 #1
    1. The problem statement, all variables and given/known data
    Calculate the maximum speed a vehicle can travel round a horizontal bend of radius 50m without skidding if the coefficient of friction between tyres and road is 0.5.


    2. Relevant equations
    I am not sure about the equation. As radius and coeff of friction are given, maybe something along these lines? v = μr


    3. The attempt at a solution
    I am puzzled as there is no mention of the weight of the car. Would this not be required in order to work it out?

    Thanks a lot.
     
  2. jcsd
  3. Jun 12, 2007 #2

    Doc Al

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    Staff: Mentor

    Is the car accelerated? What forces act on the car? How would you apply Newton's 2nd law?

    (Represent the unknown mass of the car by a symbol. "m" would be a good choice. :wink: Then work the problem out and see if you need the actual value or not.)
     
  4. Jun 12, 2007 #3
    I guess it will be gravity.

    As to Newton F=ma (?).

    Not sure whether it is accelerated, doesn't really say in question.:confused:
     
  5. Jun 12, 2007 #4

    Doc Al

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    Staff: Mentor

    Gravity is not the only force acting on the car. (If it were, it would be falling!)

    As far as whether it's accelerated, here's another clue:
     
  6. Jun 12, 2007 #5
    So there is also a velocity?
     
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