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The energy lost in a loading/ unloading cycle of rubber band Objective: Use the data which we will get in this experiment to sketch two graphs and find the gap between them, this gap is the lost energy. Method: 1.We intend some equipment to accomplish this experiment include iron-support, ruler (100CM), rubber band, masses (9 for each one is 100G), mass hanger (100G), clamps, G- clamps. 2. Firstly, we need fasten the iron-support by G- clamps and then fasten clamps in the top of this iron-support. After these, we have to measure the original length of rubber band, and hang it in the clamps. 3. Place hanger under the rubber band, and use ruler to measure the length of rubber band. Then add one mass and measure the length. Repeat this process until used all masses. 4. Remove one mass and use ruler measure the length. Then repeat this process until removed

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all masses. 5. Use these data to draw the F-X graph (F=force, X=extension). Meanwhile, analysis the data and make a conclusion.
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• Spring '14
• Mass, rubber band, original length, 0.001m

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