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!

Dynamics problem

  1. Dec 20, 2008 #1
    1. The problem statement, all variables and given/known data
    I drew this to make it easier to understand:
    [​IMG]
    E (mass: 400g) can move along the semicircle.
    ABCD is a plate rotating around (AD) axis at constant speed (14 rad/s).
    Coefficients of friction are 0.35 (static) and 0.25 (dynamic).
    I need to find out whether E will move for θ = 80º and for θ = 40º. Also I need to find the module and direction of the friction force for t0.

    2. Relevant equations
    None.

    3. The attempt at a solution
    I applied Newton's second law.
    Σ Fext = mg + N1 + N2 + f
    Where:
    mg is E's weight
    N1 is the normal force in the (ABC) plane
    N2 is the normal force perpendicular to the (ABC) plane
    f is the friction force
    I did this also so that you understand what I mean -just in case... :)
    [​IMG]

    Then I think I must use:
    aE = aO + aE/O + ωx(ωxOE) + αxOE + 2ωxvE/O
    With:
    α = dω/dt = 0
    ω = 14 j
    OE = (0.65 - sin(θ)*0.25) i


    I hope you can help me out here. Thanks a lot!
     
  2. jcsd
  3. Dec 21, 2008 #2
    Bump, anyone?
    Thanks again.
     
  4. Dec 22, 2008 #3
    Bump, please give me a hand...
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Dynamics problem
  1. Dynamics problem (Replies: 6)

  2. Dynamic problem (Replies: 1)

  3. Dynamics problem (Replies: 8)

  4. Dynamics wagon problem (Replies: 9)

Loading...