Experimental design


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Experimental design

  1. 1. Experimental Design
  2. 2. Problem QuestionWhat is the effect of the type of cup onthe bottom of the boat on the amount ofmass the boat holds?
  3. 3. Variable IdentificationIndependent Variable: Type of cup on the bottom of the boatDependent Variable: Amount of mass heldExperimental Groups: Plastic CupStyrofoam cupStyrofoam and Plastic cupControl: Plastic cup onlyConstants: Temperature of waterWindType of coin used for weightAmount of coins placed in the boat at a timeWater Level
  4. 4. HypothesisIf both the Styrofoam and plastic cups arecut in half and put on the bottom of theplastic bowl, then the amount of mass thatthe boat holds will increase, because theboats height will increase, therefore the moreof the boat will have to sink before the wholeboat sinks.
  5. 5. Materials• One container at least 8inches in diameterand at least 1 foot high• 2 towels• 1 hair dryer• at least 200 coins
  6. 6. Procedures1) Fill container with water 3/4 full2) Place the boat on the water (see figure 1)3) Add pennies 1 by 1 until the boat sinks4) Retrieve boat from bottom of container and dump the water out**While still keeping the pennies in the boat**5) Pour out the pennies on one of the towels6) Thoroughly dry the pennies with the hairdryer7) Dry the boat with the other towel8) Count and weigh the pennies9) Record the data on the chart10) Repeat steps 2-9 4 more times11) Repeat steps 2-10 with the boat with the Styrofoam bottom (seefigure 2) then with the boat with both the Styrofoam and plasticbottom (see figure 3***Figures on next slide
  7. 7. Figure 1(prototype)Figure 2Figure 3
  8. 8. Experimental Data TableMass of Boat(grams)Type of BoatAmount Of Mass Held (grams)Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Average20Plastic Cup 415 420 420 410 410 41512Styrofoam Cup 180 435 506 495 490 421.225Plastic andStyrofoamCups465 480 450 480 497 474.
  9. 9. Plastic cup boatStyrofoam cup boatPlastic and Styrofoamcup boat
  10. 10. ConclusionThe problem question investigated was, "What is the effect of the type of cupon the bottom of the boat on the amount of mass the boat holds?" It washypothesized that, if both the Styrofoam and plastic cups are cut in half and put onthe bottom of the plastic bowl, then the amount of mass that the boat holds willincrease, because the boats height will increase, therefore the more of the boatwill have to sink before the whole boat sinks. According to the investigation, thedata supported the hypothesis. For example, the boat with the plastic cup held 415grams and the boat with the Styrofoam cup held 421.2 grams. The boat with boththe plastic and Styrofoam cups held 474.4 grams which is greater than the amountof mass the other two boats held.Some possible errors in the experiment were that not close enough attentionwas paid to the constants. For example, the water temperature for all the trials wasnot constant. Also, the amount of coins placed in the boat at the same timediffered. In the trials with just the Styrofoam cup, the data was very inconsistent.Because of these errors, the data would not be very reliable. From this experiment,it was learned that the boat with both the Styrofoam and plastic cups because itwas bigger, therefore having more buoyancy. This information helped to plan thefinal design. The final design needs to have a bigger size so that it can hold moremass. In order to further improve the design, the effect of adding tinfoil to thebottom of the boat can be tested. The effect of adding a balloon to the side of theboat could also be tested. , In conclusion, the hypothesis was supported by thedata showing that the boat with both the plastic and the Styrofoam cup held moremass then the other boats. Also, the data was not very reliable because of outliersand disregarding the constants