# The Fortune Teller by wulinqing

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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
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
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
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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