Water-Logged
Designed and constructed by:
Nick Dement, Eric White, and Jake
Shelton
Team Introduction
Team D2-8
• Nick Dement
• Jake Shelton
• Eric White
Device Design Overview
• Materials:
–
–
–
–
–
–
–
–
–
Pvc Pipe
Wooden Boards
Dowel Rods
Cups
String
Rubber Bands
Swinging Weight
Nails/Screws
Duct Tape
Device Operation
• Projectile Motion- Marble & Ramp
• C.O.E. (Rotational)- Marble
• C.O.ρ. (Linear)- Collisions
• C.O.ρ. (Angular)- Weight
• Center of Mass- Balances
Device Operation Cont.
Calculations
Marble Speed at Launch: mgh=½mv²+½Iω²
h=.416 ft ω=(v/r) I = ⅖ m(r)² g=32.2 ft⁄s²
m(32.2)(.416)= ½mv²+½(⅖m(r)²)(v²⁄r²)
(32.2)(.416)= ½v²+½(⅖(r)²)(v²⁄r²)
(32.2)(.416)= ½v²+½(⅖)v²
V=4.378 ft⁄s
Weight Angular Speed at Impact:
mgh=½mv²+½Iω²
h=.5417 ft
I=mr²
v=ωr
r=.7917 ft
m(32.2)(.5417)=½m(ωr)²+½(m(r)²) ω²
(32.2)(.5417)= ½(ωr)²+½(r)²ω²
(32.2)(.5417)= ½(ω)²(.7917)² +½(.7917)²ω²
ω=5.275 rad⁄s
Device/Construction Issues
• Problems with:
– Maintaining stability
– Making device
repeatable
– Getting precisely
sized objects to
operate machine
adequately
• “If at first you
don’t
succeed, try,
try again.”Thomas
Palmer
Conclusions
• Eventually, our team created a successful
device.
• The device is repeatable for completing its job,
but inefficient and complicated in doing so.
• Through trial and error, as well as some
calculations, our team produced a working
machine and completed the project.