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Help newton's 3rd law

  1. Jul 15, 2008 #1
    1.) a 50kg block is being pulled at a constant speed along a horizontal surface by a horizontal force of 120N.

    Q: what is the coefficient of kenetic friction?

    2.) a 100kg wooden crate is being pushed across a wooden floor with a horizontal force of 350N.
    Q: What is the net force acting on a crate?

    3.) A cabinet weighing 400N is pulled along a horizontal floor at constant speed by a rope which makes an angle of 30 degrees with the floor.

    Q: what is the coefficient of sliding friction if the force on the rope is 220N?

    Thanks in advance...
  2. jcsd
  3. Jul 15, 2008 #2
    Could you show what solving strategy you have applied here?
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