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A Block Sliding Down an Incline

  1. May 31, 2009 #1
    1. The problem statement, all variables and given/known data

    Starting from rest, a 5 kg block slides 2.5 m down a rough 30 degree incline. The coefficient of kinetic friction between the block and the incline is 0.436. The acceleration of gravity is 9.8 m/s2.

    Find the work done by the force of gravity.

    Find the work done by the normal force.

    2. Relevant equations

    Wgravity = mgh

    3. The attempt at a solution

    I figured out work done by force of gravity:

    Wgravity = (5 kg)(9.8 m/s2)(2.5sin30) = 61.25 J

    However, I don't know how to find the work done by the normal force. Is it the same as work done by gravity?
  2. jcsd
  3. Jun 1, 2009 #2


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    Homework Helper

    There is another force involved - friction.
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