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Forces of friction with angles

  1. Oct 17, 2004 #1
    I know the formula for friction coefficients is force over weight, but i dont understand what to do when angles are involved. Please help me by showing me where to put the angle measurements in this problem.

    A 1000-N crate is being pushed across a level floor at a constant speed by a force F of 300N at an angle of 20 degrees below the horizontal. What is the coefficent of kinetic friction between the crate and the floor?
  2. jcsd
  3. Oct 17, 2004 #2
    your going to use vector addition. you must find the force in its components. (x and y). You can use this using simple trig laws. it helps to draw a free body diagram. good luck!
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