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The Fortune Teller

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					 The Fortune Teller
   Tyler Huber, Hanya Senno,
Jody Dykes, and Jessica Millsaps
    OUR IDEA:
After eating at P.F.
Chang’s, we were too
 lazy to break open
  the fortune cookie
      ourselves.
 We designed the
Fortune Teller to do it
        for us.
The Fortune Teller is a Rube-Goldberg device
 that breaks a fortune cookie open in order to
 see the fortune inside. It is a simple device
 consisting of a chain of events that lead to a
 mallet being knocked down to break open the
 fortune cookie.
How It works
Measurements
                           Calculations
•   Wooden ball to marble
     – Calculate velocity of wooden ball as it hits the marble
          • 1/2mvi 2 + mghi=1/2mvf2 + mghf
     – Givens: vi =0 ft/sec, hi=7 in (or .583 ft), hf=.5 in (or .042 ft), and
       m=6.2*10-5 slugs
     – vf = 3.67*10-4 ft/sec.
•   Marble to wooden blocks
     – Calculate velocity of marble when it first moves down the ramp
        • m1v1 + m2v2 = m1v1′ + m2v2′
     – Givens: m1= mass of ball=6.2*10-5 slugs, v1= 3.67*10-4 ft/sec,
       m2=mass of marble=.0011 slugs, v2=0 ft/sec and v1′= 0 ft/sec
     – velocity of the marble v2′ = 2.035 *10-5 ft/sec
                          Calculations
•   Marble to wooden block
     – Calculate velocity at which the marble hits the wooden block
          • (1/2mvi 2 + mghi=1/2mvf2 + mghf)
     – Givens: vi=2.035 *10-5 ft/sec, hi=18.25 in (1.52 ft), hf =14.5 in (or 1.21
        ft), and m= .0011 slugs
     – vf= .0049 ft/sec
•   Velocity of wooden block after it is hit
     – (m1v1 + m2v2 = m1v1′ + m2v2′)
     – Givens: m1=mass of marble=.0011slugs, v1=.0049 ft/sec, m2=mass of
        wooden block=7.45*10-3 slugs, v2=0 ft/sec, and v1′=0 ft/sec
     – v2′=.0072 ft/sec
     – Assume that velocity is constant throughout the domino
       effect
                        Calculations
•   Boot to mallet
     – (m1v1 + m2v2 = m1v1′ + m2v2′)
     – Givens: m1=mass of the boot=.003 slugs, v1=.0072 ft/sec, m2=mass of
        mallet=.039 slugs, v2=0 ft/sec, and v1′=0 ft/sec

     – v2′= 5.64*10-4 ft/sec
        “Money, Money, Money”
            aka Expenses
• The bill of materials for this project consists
  of wood, costing around $6, paint ($7), and
  the mallet ($2). Total cost $15
• All other materials were obtained from our
  previous possessions and the fortune cookies
  were given to us for free. 
                    Conclusion
• Overall, we were successful in creating a working
  Rube-Goldberg device.
• Problems we incurred during the project included
  finding a way to create a heavy enough mass on
  the boot for it to knock the mallet over and creating
  a strong foundation to hold the mallet.
• Another problem we came upon after building the
  device was that the distance between the mallet and
  boot was a little too close.
   – We solved this by adding paper in between the mallet
     and its back support.
*Random Pictures of our group*
   We love engineering! Can’t you tell?




                     WHAT A STUDLY
                    ENGINEERING TA!!

				
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posted:10/19/2011
language:English
pages:11