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Homework Help: Block with Two Weights

  1. Jun 27, 2005 #1
    In the figure below, assume that the pulleys are massless and frictionless.

    https://www.physicsforums.com/attachment.php?attachmentid=4001&stc=1 23.png

    The masses of the blocks are Ma=1.50 kg, Mb=3.00 kg, Mc=5.00 kg, and there is friction between the horizontal plane and Mc, (μk≠0). Mc is observed to travel at a constant velocity.

    A. Calculate the coefficient of kinetic friction between Mc and the horizontal surface.

    B. Mass Mb is now increased by 0.40 kg. Calculate the magnitude of the acceleration of Mc.

    Attached Files:

    • 23.png
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  2. jcsd
  3. Jun 28, 2005 #2
    Draw the free body diagram taking into account the friction forces, tensions in ropes , mg downwards and Normal Reaction on Mc. As Mc travels without acceleration, equate all forces.

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