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 flux capacitor
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.
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.
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
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.
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
-Proper length of string for mousetrap triggers, and ways to trigger mousetraps
-Adjusting ramps, strings, marble locations, and everything, to make it work
EVERY. SINGLE. TIME.
Triggering a device
-Finding a way to trigger anything.
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