Post on 18-Dec-2015
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!!