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Doc Brown and the crew Presents The flux capacitor Joshua jefferies Isaak Samsel Austin Bootin Jesse dowdy overview Marble falls down ramp into a cup, and then into a funnel. The cup pushes another marble, which goes down several ramps, and hits a mouse trap. The first marble falls into a stoppered tube. The mouse trap pulls a stopper and releases a sinker, which pulls a pulley. A cylinder rolls down a ramp and triggers a mouse trap, which pulls the stopper on the first marble, releasing it onto another mousetrap, which pulls the switch off of the alarm clock. Calculations Of destiny Conservation of Energy Velocity vector of first marble as it leaves the ramp mgh = 1/2mv2 + 1/2Imarble (v2/r2) v = 4.796 ft/s at a 52 degree angle below the horizontal. Angular Momentum The initial Y component of the marbles velocity as it hits the cup = 2.595 ft/s Angular momentum of the swing: L = r X p (Cross product) L = 5.725*10-4 slugs ft2 per second Torque t = Fr since string is perpendicular to radius of the pulley t = .002604 ft lbs This torque is greater then the torque exerted by the stop’s weight, allowing the pulley to do it’s thing. Conservation of Linear Momentum Conserved when the cylinder rolls down the ramp and triggers the mouse trap The momentum of the rod, as it leaves the ramp, is .00729 slug ft per second The impulse of the collision triggers the mouse trap, since J = dP = F dT , the force exerted on the mouse trap, if the collision lasts .5 s, is .014 lbs. The trap only requires .004411 lbs. Design and construction issues Structure and backbone -Boring holes for screws, to mount anything and everything and to connect backboards Ramps, pipes, and crossing over. -Keeping marbles on the track -Angle to maintain energy -Changing directions to cross over to the other side Mousetraps and pulley -Attempting to use marble for counterweight to release the stop on the pulley’s counterweight -Proper length of string for mousetrap triggers, and ways to trigger mousetraps Consistency -Adjusting ramps, strings, marble locations, and everything, to make it work EVERY. SINGLE. TIME. Triggering a device -Finding a way to trigger anything. …in conclusion In the end, we spent $19.65 on materials. Setting up a Rube Goldberg machine isn’t as easy as it looks By delegating each group member tasks that they excel at, we managed To finish the project in a reasonable time, and with maximum creativity. Step 1: Brainstorm Step 2: Buy materials Step 3: Begin construction Step 4: Mousetraps