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Homework Help: Fuzzy dice question

  1. Feb 15, 2010 #1
    1. The problem statement, all variables and given/known data

    A 0.0820 kg pair of fuzzy dice is attached to the rearview mirror of a car by a short string. The car accelerates at a constant rate, and the fuzzy dice hang at an angle due to the car's acceleration. If the dice hang at 5.00° from the vertical as the car accelerates, what is the acceleration of the car?

    2. Relevant equations

    F=ma, trig functions.

    3. The attempt at a solution

    So I have the freebody diagram with mg pointing down, Fn pointing up, and Fa pointing downward at a 5 degree angle from the y axis. I know how to find mg of course, but now I'm just lost. Please help me at least wave my hands at this thing...
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Feb 15, 2010 #2


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    Science Advisor
    Homework Helper

    Welcome to PF!

    Hi sheepcountme! Welcome to PF! :smile:

    Hint: the acceleration of the dice is the same as that of the car.

    So use good ol' Newton's second law (vector form), Ftotal = ma. :wink:
  4. Feb 15, 2010 #3
    Thank you!

    I figured it out! What a relief! I was making it much more complicated than it needed to be!
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