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Determine the components of force

  1. Apr 8, 2009 #1
    1. The problem statement, all variables and given/known data
    the boy of mass 40kg is sliding down the spiral slide at a constant speed such that his position, measured from the top of the chute, has components r=1.5m, theta=.7t radians, and z = -.5t m, where t is in seconds. Determine the components of force for F(r), F(theta), and F(z) which the slides exerts on him at the instant t=2. Neglect the size of the boy



    2. Relevant equations

    a(r)=r''-r(theta)'^2 F(r)=ma(r)
    a(theta)=r(theta)''+2r'(theta)' F(theta)=ma(theta)
    a(z)=z'' F(z)=ma(z)


    3. The attempt at a solution

    I got F(r)=-29.4 N and I got 0 for the other 2 Forces. Is this corect
     
  2. jcsd
  3. Apr 8, 2009 #2

    LowlyPion

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    Homework Helper

    In the way you have answered it, I'd say it looks correct.

    But the question seems to ask for the components "for" these forces, and I am not sure that they don't want the components ... you know like the friction force offsetting the acceleration effects from gravity?
     
  4. Apr 8, 2009 #3
    ya lost me, please elaborate
     
  5. Apr 8, 2009 #4

    Astronuc

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    Staff: Mentor

    The boy is sliding down the spiral slide at a constant speed, and r is constant.

    Don't forget the boy has weight acting downward.
     
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