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Homework Help: Forces question

  1. Feb 26, 2010 #1
    A crate of books is to be put on a truck with
    the help of some planks sloping up at 33◦. The
    mass of the crate is 100 kg, and the coefficient
    of sliding friction between it and the planks is
    0.4. You and your friends push horizontally
    with a force ~F .
    The acceleration of gravity is 9.81 m/s2 .
    Once the crate has started to move, how
    large must F be in order to keep the crate
    moving at constant speed?
    Answer in units of kN.
  2. jcsd
  3. Feb 26, 2010 #2
    Show your work.
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