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Eka Yulisari Asmawati, Eka Yulisari
Sekolah Menengah Atas Negeri 1 Metro
Education Physics

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MEMBANDINGKAN TEGANGAN PERMUKAAN DENGAN TEGANGAN AIR MENGGUNAKAN ZAT PEWARNA MAKANANAN SEBAGAI ALAT PERAGA PEMBELAJARAN Asmawati, Eka Yulisari
Jurnal Pendidikan Fisika Vol 2, No 2 (2014)
Publisher : UNIVERSITAS MUHAMMADIYAH METRO

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Abstract

Have performed experiments to compare the surface tension of water by the surface tension of alcohol use food dye. The research method is to perform a simple test. With a drop of food dye into water will make the water molecules become larger and when alcohol was dropped into the solution there will be a tug between water and alcohol with water or with alcohol-called cohesion. Tug between different molecules such as water to alcohol is called adhesion. Cohesion of water molecules is greater than the cohesion of the alcohol molecules. Cohesion of water is also greater than the adhesion between the two fluids. Competition between cohesion and adhesion molecules of water and alcohol lead to mutual attraction between water and alcohol resulting in vibrations when the fluid is met. The results obtained when this trial is water that has spilled food dye will move away from the alcohol and water colored parts that come into contact with alcohol will vibrate.
MENGUKUR LAJU AIR KELUAR DARI BOTOL PADA TIAP LUBANG DENGAN KETINGGIAN TERTENTU Asmawati, Eka Yulisari
Jurnal Pendidikan Fisika Vol 2, No 1 (2014): Jurnal Pendidikan Fisika JPF FKIP UM Metro
Publisher : UNIVERSITAS MUHAMMADIYAH METRO

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Abstract

Experiments have been conducted to measure the rate of water out of the bottle on each hole with a certain height. The research method is to perform a simple test. Tests carried out using perforated by nails bottles are heated / solder. When it was acquired 5 hole will be closed by the bottle duct tape / plaster. Then bottle filled with water to the brim, open the first hole, then count the time the water out of the hole, this step is done repeatedly until the fifth hole. After the results of the data obtained will be used widely calculation formula bottle (A= πd2 ), water discharge (Q =  ) and the rate of water (v = ). The results of these calculations found that the fourth hole or holes which position has the lowest rate of water faster than others. This is because in the lowest position, they experienced greater pressure than the top position. So, with tremendous pressure to make the flow of fluid to flow faster.
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