TP LAB #2

PURPOSE: How accurately can you account for experimental error?

TO DO ITEMS:

  • Create a method to accurately and reproducibly (?) determine the maximum downward force that can be exerted on a roll of toilet paper WITHOUT breaking it; and then calculate/predict the resulting maximum resultant angular velocity of that TP Roll

  • Determine a method to calculate the expected angular velocity of that TP Roll based on that data

  • Determine a method to calculate the expected angular momentum of that TP Roll based on that data

  • Investigate your error and account for that error mathematically and through further investigation/experimentation (see below).

Report your findings in a Tabloid Article format as determined by the class... now.

Then:

  • Design a method to apply that force to the TP roll

  • Precisely apply that force

  • Measure the resulting angular velocity (how?)

  • Measure the resulting angular momentum (how?)
  • Compare your theoretical/calculated initial values with your resulting experimental/actual values and calculate the % error.

  • Investigate your error and account for that error mathematically and through further investigation/experimentation.
    • For Example: Let's say we were conducting an investigation to determine which make/model car get's the best gas mileage.

      • We determined that the Toyota Prius achieved the highest gas mileage of all vehicles tested at 43.5 mpg.

      • Upon conducting further research we found that the ACTUAL gas mileage for a Prius was 49.8 mpg.

      • We calculate the error to be <whatever it is>

      • We investigated further and found out our car had a small hole in the gas tank that was dripping <However much it did> gallons of gasoline per trial.

      • That loss of <whatever it is> gallons of gasoline would account for a loss of <However much it did> miles per gallon which would account for <some %> of our error.