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Homework Help: Newton's Law Problem

  1. Sep 19, 2011 #1
    1. The problem statement, all variables and given/known data

    A child holds a sled on a frictionless, snow-covered hill, inclined at an angle of 25 degrees.If the sled weighs 56 N, find the force exerted on the rope by the child.

    2. Relevant equations

    3. The attempt at a solution
    I set up a right triangle with 56N as the hypotenuse. I then figured the x component of force, or the force exerted on the rope by the child, to be 56sin25. I got 23.67N but when I submitted this it was wrong am I missing something here.

    Last edited: Sep 19, 2011
  2. jcsd
  3. Sep 19, 2011 #2


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    Homework Helper

    That answer looks right to me.
    The method is not. The 56 N acts straight down, and 56*sin(25) is the component acting downward along the hill. An equal force upward along the hill is needed to cancel it.
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