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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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