The Fortune Teller by wulinqing


									 The Fortune Teller
   Tyler Huber, Hanya Senno,
Jody Dykes, and Jessica Millsaps
After eating at P.F.
Chang’s, we were too
 lazy to break open
  the fortune cookie
 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
•   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
•   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
•   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. 
• 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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