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Homework Help: Frictional force on the block

  1. Jun 25, 2008 #1
    1. The problem statement, all variables and given/known data
    A 1.6-kg block slides down a plane (inclined at 25° with the horizontal) at a constant speed of 2.0 m/s. At what rate is the frictional force doing work on the block?

    2. Relevant equations

    3. The attempt at a solution
    I think that you have to find the potential energy, kinetic energy, 1/2mv^2 , and the force acting on the block, f =m* g. then subtracting the potential from the kinetic and force and this should give me the frictional force acting on the block, right?
  2. jcsd
  3. Jun 25, 2008 #2


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    Homework Helper

    Re: energy

    well you have no information to find the potential energy, so you'll need to consider forces.

    If it moves at a constant speed of 2.0 m/s what does this imply about the resultant force on it? (Newton's First law can aid you here)

    When you know this, just consider all the forces parallel to the plane.
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