This study aims to determine the increasing of high school students’ motivation in learning physics through the use of computer simulation media in terms of parents’ employment background. The method used in this study is quasi-experimental method. This research was conducted in class X SMAN 1 Lhoknga Aceh Besar. The data collection was gathered by giving a pretest and posttest questionnaire of student motivation. Then, the administration of a questionnaire survey was conducted to find out the background of the parents’ employment. The results of the study showed that the use of computer simulations media could increase student motivation. The survey results showed that in the experimental class the student whose father works as a vegetable seller and his mother as a housewife got the highest increase of motivation. Furthermore, students who experienced the lowest increase of motivation both parents were victims of tsunami disaster in 2004. In the control class, students who experienced the highest increase of motivation came from a family whose father works as a fisherman and his mother is a housewife. Whereas, Students who obtained the lowest increase of motivation, his father has temporary jobs and his mother is a housewife.
Elastic modulus value is usually evaluated by employing a large tensile equipment with a standard round bar specimen. In order to measure the elastic moduli of materials in extreme low or high temperature conditions, the equipment needs an elaborate device and the device will become larger and expensive. A simple instrumentation system is developed to determine elastic moduli of various materials over wide range of temperatures by impact sound of a specimen which is suspended by thin string in a furnace or a refrigerator.The method needs a small rectangular specimen about 4x5x50. Suspending a specimen in an atmosphere filled with liquid nitrogen vapour or heated up by furnace, an impact to the specimen was brought about by a small sphere ball. Analyzing the sound emitted from the specimen by Fast Fourie Transform device and applying a relation between Young's modulus and a natural frequency, Young's modulus value on steel, cupper and aluminum were measured with ease over -190℃ near to melting point temperature of each material.
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