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Frictional Force

  1. Oct 14, 2007 #1
    a block is at rest on the incline shown in the figure. the coefficients of static and kinetic friction are s = 0.42 and k = 0.36 respectively. The acceleration of gravity is 9.8 m/s^2. the angle of inclination is 19 degrees.

    what is the frictional force acting on the 43 kg mass? answer in units of N.

    Honestly I have no idea what to do on this problem...
  2. jcsd
  3. Oct 14, 2007 #2


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    If the block is at rest, you need only to identify all the forces acting on the block and apply Newton 1 to solve for the unknown friction force.

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