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Homework Help: Block on Incline

  1. Feb 22, 2010 #1
    1. The problem statement, all variables and given/known data

    A cube of mass M=0.425 kg is placed on an incline of 12.5* and given a push. It slides down, and its speed down the incline is measured at two positions, [1] and [2] on the diagram below, with V1 = 0.913 m/s and V2 = 1.171 m/s. Note that the incline passes through at least two grid intersections and that one cube corner is at x grid lines. (See attachment.)

    A. Calculate μk, the coefficient of kinetic friction for the block on the incline.

    B. Calculate the travel time of the cube from position 1 to position 2.

    2. The attempt at a solution

    A. Attempt 1 - Incorrect - 0.813
    Attempt 1 - Incorrect - 0.2216
    Attempt 1 - Incorrect - 0.222

    B. Attempt 1 - Incorrect - 2.67 s

    Attached Files:

  2. jcsd
  3. Feb 22, 2010 #2
    What is the problem? Just calculate the acceleration down the incline with a supposed coefficient of friction. Then use kinematic eqns. to make out the coefficient.
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