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Mechanics problem: Ladder on a wall help please

  1. Jun 6, 2010 #1
    Mechanics problem: Ladder on a wall help please :(

    1. The problem statement, all variables and given/known data
    "A ladder of weight 200n and of length 5m rests with its lower end on a horizontal rough concrete surface and its upper end against a smooth wall. if the ladder just starts to slip when the angle between it and the concrete is 40(degrees) calculate the coefficient of static friction:"

    having trouble with trigonometry here, i can do questions where i have lengths but no angle but this one is spinning me out.
  2. jcsd
  3. Jun 6, 2010 #2


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    Welcome to PF!

    Hi learning420! Welcome to PF! :wink:

    Draw a diagram showing the normal force form the ground, the friction force, the weight, and the direction of the force from the wall, and take components and moments …

    what do you get? :smile:
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