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Homework Help: AP Physics-Potential Energy and Conservation.

  1. Nov 4, 2009 #1
    A worker pushed a 27 kg block 7.8 m along a level floor at constant speed with a force directed 33° below the horizontal.
    (a) If the coefficient of kinetic friction is 0.20, how much work was done by the worker's force?
    (b) How much energy was dissipated by the frictional force?
    please i really don't know how to answer this.
  2. jcsd
  3. Nov 4, 2009 #2


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    Homework Helper

    You HAVE to able to start before anyone can help you. Draw a force diagram. What forces are acting on the block?
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