# Doc Brown and the crew Presents The flux capacitor - PowerPoint PPT Presentation

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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.

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Doc Brown and the crew Presents The flux capacitor

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#### Presentation Transcript

Doc Brown and the crew

Presents

The flux capacitor

Joshua jefferies

IsaakSamsel

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