1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    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


    User Avatar

    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.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook