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Physics CAT OneExtended Practical InvestigationReportStudent NumberPurpose The Purpose of this investigation is to explore how the terminalvelocity of a sphere falling through glycerol varies with the temperature of the glyceroland the size of the sphereIntroduction In the early stages of the project it was intended to investigate howthe speed of a sphere falling through glycerol varies with the size of the sphereHowever after analysis it was decided that the investigation would be more callenging ifa second variable was incorporated There are many constants that could have beenmanipulated such as amount of glycerol used distacnce over which times were takendistance sphere was allowed to fall before timing was taken and the temperature of theglycerol After much consultation it was decided that the temperature of the glycerolshould be varied Once this had benn incorporated into the investigation some scientificconcepts related to the viscosity of a liquid had to be attained Refer to article In conducting the experiments an attempt was made to attain resultsthat could produce graphs that showed the terminal velocity of a sphere related to thetemperature of the glycerol and the terminal velocity of a sphere related to its sizeApparatus used 600 ml of glycerol density 126ml Assay 980 - 1010 Small ball bearings of radius 3175mm3960mm5000mm6000mm7000mm 900 ml measuring cylinder Stop watch Thermometer Some type of heating and cooling device to varie the temperatureof the glycerol TweezersVariables and Constants The variables that have been used in this investigation are the size ofthe ball bearings and the temperature of the glycerol The constants that have been usedin this investigation are the amount of glycerol used the size of the measuring cylinderthe intervals at which time were taken the distance the sphere was allowed to drop beforetimes were taken and the number of tests takenMethod To begin experimentation the distance over which the sphere acceleratesto reach terminal velocity had to be determined This was done by systematically varyingthe distance over which the sphere was allowed to
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