Robin Solomon Geoscience Period 2 January 19, 2010 Exploring Energy ResourcesIntroduction : Energy is used in many different kinds of forms. It is used to power everydayresources like electricity and moving vehicles. When a car moves up the mountain, theroad has energy too because of the motion. This is called kinetic energy. Another typeof energy is potential energy and this is energy due to its position in a gravity field. Anexample for this are roller coaster cars. The cars are being lifted but as it reaches thetop, it will go on it’s way due to gravity. Lastly, chemical energy is energy that is storedas fuel in its gas tank. Examples of chemical energy would be a car battery, and fuelthats being burnt in cars and airplanes. In this lab experiment, our goal was to findout which cup will keep the water hot for a longer amount of time.Research Question = How does the different materials of the cup (paer, metal, glass,plastic, Styrofoam) affect the rate of heatloss?Independent Variable = The rate of heatlossControlled Variable = the initial starting temperature (55 degrees celcius) and theamount of water in each cup (40 ml)Hypothesis : I think that the Styrofoam cup will affect the rate of heatloss becauseStyrofoam is light and the material is soft so therefore the heat will decrease quickly.Materials/Procedure:
• Different cups (paper, plastic, Styrofoam, glass, metal) • Thermometer • Water pump (water squeezer) • Beakers • Hot plate • water 1. Boil the water in a beaker and the place the thermometer in until the temperature of the water is 55 degrees celcius. 2. Using the small water pump put equal amounts of water (40 ml) in each cup and record temperature in each cup after 5 minutesData Processing:Material of cup Temperature after 5 Percent of heat left Percent of heatloss minutes (celcius °) after 5 minutesPaper 36 65.45 34.55metal 39 70.90 29.10
Series 1 = Temperature of water in celciusSeries 2 = Percent of Heat LeftSeries 3 = Percent of heatloss after 5 minutes.Conclusion / Evaluation: In conclusion, my hypothesis was not supported because I thought that thestyrofoam cup will contribute to the greatest amount of heatloss. It turned out to be thepaper cup that had the large amount of heatloss after 5 minutes. The percentageheatloss after 5 minutes for the paper cup was 34.55 and the material with the lowestpercentage of heat loss is the Styrofoam cup. The reason for this is because, paper issoft and when warm water is poured in, it will lose heat faster. If it was the metal cup, itwould be different because the water will stay warm longer because metal retains heat.Errors and weaknesses that may have affected the lab results is maybe not pouring
equal amounts of water in the cups. Also, when pouring the warm water in the papercup, it was cone shape so it over flowed.