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A car goes around a vertical circle (Uniform Circular Motion)

  1. Oct 30, 2009 #1
    1. The problem statement, all variables and given/known data


    A small remote-control car with a mass of 1.51 kg moves at a constant speed of v = 12.0 m/s in a vertical circle inside a hollow metal cylinder that has a radius of 5.00 m.

    [​IMG]


    What is the magnitude of the normal force exerted on the car by the walls of the cylinder at point A (at the bottom of the vertical circle)?

    What is the magnitude of the normal force exerted on the car by the walls of the cylinder at point B (at the top of the vertical circle)?


    Do I utilize Fnet = ma which would give me 43.488N as Fnet, but I do not see how that would help? I don't know what to do.
     
  2. jcsd
  3. Oct 30, 2009 #2
    Try drawing a force diagram when the car in at the bottom of the cylinder and when its
    at the top of the cylinder.
     
  4. Oct 30, 2009 #3
    For Part A, it would just be Fn pointing up and w pointing down.

    w=mg so (1.51kg)(-9.8) = -14.798N so Fn must be 14.798N ?


    Would part B basically be the same?
     
  5. Oct 30, 2009 #4
    F_y = m*a_y
    a_y = v^2/r

    Does that help?
     
  6. Oct 30, 2009 #5
    For part A it should be N - mg = 0, right ? Since mg is pointing down thus N has to be
    pointing up.

    For part B its not quite the same.
     
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