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Group 4 Project
- 1. Group 4 Project: Group 3Presented By: Victoria, Cindy, Pin, Ani
- 2. Introduction: AimThe aim of this experiment was to determine how temperature affects the elasticity of rubber bands. Rubber’s scientific name is polyisoprene, and is made of the repeating unit shown below.
- 3. Research QuestionHow do different temperatures, measured in degrees Celsius, affect the elasticity of rubber bands?
- 4. MaterialsA pack of rubber bandsForce gauge1 tray (one that it relatively tall and long)Utility clamps or metal hooksThermometerHot plateIceBeakers
- 5. ProcedurePlace the utility clamp at the edge of the trayPlace a wooden stick in the clamp and tighten it so that the stick would not move Add enough water to submerge the wooden stickTake the temperature of waterplace rubber bands in the water and make sure they are completely submerged
- 6. Procedure (cont.)6. Leave rubber bands about 10 minutes in the water7. Mark a point (A) on the stick and bind the rubber band around it and use a force gauge to pull the rubber band to point B. point B is located about 20cm above point A.8. Record the force.9.After 10 trials using the same temperature, change the temperature of the water.10. Either add ice to decrease the temperature, or boil the water on the hot plate to increase the temperature.
- 7. Results of the investigation
- 8. Results of the investigation (cont.)
- 9. Brief conclusionResults for t test between highest temperature (68.5 degrees) and lowest temperature (5 degrees)P value and statistical significance: The two-tailed P value equals 0.0962 By conventional criteria, this difference is considered to be not quite statistically significant. 95% confidence interval of this difference: From -0.098 to 1.098
- 10. Evaluation: weaknesses/limitationsThe length the rubber band was pulled may not have been the same during every trial, so the force may have been affected.The force gauge was not always perpendicular to point A of the rubber band, so the force measured may have varied.
- 11. Evaluation: suggestionsUse a digital force gauge
- 12. Thank You : )