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Homework Help: Work formula Problem

  1. Oct 12, 2006 #1
    I have pretty much figured out the problem, but i am unsure of my work.
    the question reads:
    a 330kg piano slides 3.6m down a 28degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.40. Calculate: (a) the force exerted by the man.

    F=mgsin(theta)
    =(330kg)(9.81m/s2)sin90
    F= 3237.3 N

    Is this the correct formula to use to find the force exerted by the man?
     
  2. jcsd
  3. Oct 12, 2006 #2

    berkeman

    User Avatar

    Staff: Mentor

    Where is the force due to the friction? The man's job is made easier by the help of friction.
     
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