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Device Overview
• Project Jag is a Rube-Goldberg device which utilizes gravity to perform the task of turning on a light bulb.
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Energy Conversions Overview1) The jaguar (not mini cooper) rolls down the
incline2) The elevated tennis ball swings to knock over
the box3) The battery falls through a funnel and hits the
metal box which turns on the light bulb
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Assumptions
• Friction neglected• Velocity of battery falling through funnel is zero
at point right before stem• Air resistance neglected
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Calculations
• Energy Equation 1 mgh=0.5mv^2 Masses cancel gh=0.5v^2 (32.2ft/s^2)
(0.21ft)=0.5(v^2) v=3.7ft/s
• Energy Equation 2 mgh=0.5mv^2 Masses cancel gh=0.5v^2 (32.2ft/s^2)
(0.5ft)=0.5(v^2) v=5.7ft/s
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Calculations
• Energy Equation 3*Note, velocity will vary with height of table. Given formula
is with height of test table. mgh=0.5mv^2 Masses cancel gh=0.5v^2 (32.2)(2.2ft)=0.5(v^2) v=11.9ft/s
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Demonstration
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Problems
• Making sure we had all supplies we needed• Figuring out a way to make the battery
consistently fall into funnel• Finding an object small enough to fit through a
funnel but heavy enough to flip a switch
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Conclusion
• Rube-Goldberg devices are complicated ways of doing simple tasks but good real life examples of physics at work
• Jaguars and mouse traps don’t mix