Recent Changes

Things Left To Do:
For experiment 1:
the hypothesis (Matt M.)
One idea: "The net torque on the propeller from the band is approximately (neglecting friction) proportional to the number of twists (equivalently the angle of rotation)"
independent variables (Matt M.)
Upload graphs + data (Matt M.)
Determine the the propeller (Everyone?)
(Determine the "spring constant" of the rubber band (using a hanging mass)?)
Analyze the results
Conclusions: what worked, what didn't, what to draw from this
For the next experiment (energy stored in the band):
the hypothesis (Matt M.)
One idea: "The amount of potential energy stored in the band is (neglecting friction) proportional to the number of twists"
Write up + carry out procedure

http://www.amazon.com/Plastic-Dragonfly-Assortment-1-dz/dp/B0035RRPJE/ref=pd_bxgy_t_img_y
Finding the amount of work that is lost due to friction during the winding and flight
Things Left To Do:
For experiment 1:
Write up the hypothesis
One idea: "The net torque on the propeller from the band is approximately (neglecting friction) proportional to the number of twists (equivalently the angle of rotation)"
Clarify the dependent and independent variables
Upload graphs + data
Determine the rotational inertia of the propeller
(Determine the "spring constant" of the rubber band (using a hanging mass)?)
Analyze the results
Check the hypothesis
Calculate the torsion K constant for the spring, if there is a linear relationship between torque and twists as hypothesized
Conclusions: what worked, what didn't, what to draw from this
For the next experiment (energy stored in the band):
Write up the hypothesis
One idea: "The amount of potential energy stored in the band is (neglecting friction) proportional to the number of twists"
Write up + carry out procedure
Tape string attached to force sensor to the tip of the propeller and record the force needed to keep the propeller from moving after 5, 10, 20, 50, and 100 twists
Take the integral of the best-fit curve (?) to approximate the energy required to twist it 100 times
Create and upload the graphs
Analyze the results
Conclusions
(Remaining question: how much of the energy lost from the airplane system is lost to accelerating the air and how much is lost to friction? Is it possible to run the experiment again in a vacuum chamber or use a propeller that doesn't move much air? That way it might follow simple harmonic motion)
(If more time: vary the length or thickness of the rubber band, checking its "spring constant" with a hanging mass, to see what affects K)
RESOURCES

show me the equations and your prediction for the terminal velocity in the fluid today.
then we need to determine the prediction
liquid, then thecoefficientthe coefficient of viscosity
independent & dependent variables (clearly indicate): independent: type of liquid; dependent: coefficient of viscosity of liquid
Natland Note (2/07/13): A couple things:
Dropping a paperclip in water 350fps
Smashing a watermelon with a sledgehammer 250fps
To Do List
finish abstract
elaborate on data analysis methods in procedure
edit lab setup illustration
analyze data with excel graphs to get results
write conclusion on google doc
New Project
Project 1

data analysis into excel, what graph are you creating and how is it giving you the data you need?
determine the rotational interia of your assembly and H(com)...where do you want to start the hammer?
(state here): With a varying radius, and consequently, entrance velocity, the impulse of a hammer breaking through a pane of glass should remain constant.
independent & dependent variables (clearly indicate):
Independent: Radius
Dependent: Entrance Velocity, Impulse
Google Doc:
YesWeAreAliens

Measure the mass of the hammer in order to apply momentum conservation to the experiment where the combined momentum of the hammer-glass system before impact is equal to the momentum after impact
Materials:
### EstwingEstwing 64 oz.
18 in. x 36 in. Clear Glass
2 in. x 10 ft. PVC Sch. 40 Plain-End Pipe
Using the footage, measure the distance the stone travels over time to calculate velocity
Use the same technique to calculate wave speed, and if the camera shot the action on a level surface, amplitude can be determined.
Game Plan:
Conduct another experiment, breaking a pane of glass at a shorter radius (slower entrance speed)
Analyze the results from all experiments, collecting data on pixel versus frame. Proceed to determine the metric length of one pixel, and convert frames to seconds. Graph resulting data in excel and fit a best fit line to the data.
Calculate the experimental as well as the theoretical impulse and cross reference the results with our hypothesis.
Finish write up for the experiment.
RESOURCES
http://www.homedepot.com/p/t/202183864?catalogId=10053&langId=-1&storeId=10051&superSkuId=202847688&N=5yc1vZc261&R=202183864#.URhkdlqfhQY

show me the equations and your prediction for the terminal velocity in the fluid today.
then we need to determine the prediction
(state here): If a ball with known properties (mass,volume) is dropped through a liquid, then thecoefficient of viscosity of the liquid can be determined.
independent & (clearly indicate): independent: type of liquid; dependent: coefficient of viscosity of liquid
Natland Note (2/07/13): A couple things:
One, that team name is still a bit inapprop's....give me something a bit tamer....until then....well you see it

Team Members:Dughi, Sam, and Ethan
Natland Note (4/15/13):
doMake your googledoc open to all so I can access it. Show it to me today in class.
do another experiment? Today?Today!
data analysis into excel, what graph are you creating and how is it giving you the data you need?
time graph andto get slopeequation for terminal velocity?the resistive force?
polish the word document that you have for the experiment.
show me the equations and your prediction for the terminal velocity in the fluid today.
then we need to determine the prediction
hypothesis (state here):
independent & dependent variables (clearly indicate):