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W101BLLab01(2) - Physics 1BL Introduction CHARGE Winter...

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Physics 1BL · C HARGE · Winter 2010 Page 1 Introduction These lab activities will focus on the concepts of charge interactions and charge transfer. You will create a model of charge based on your experimental observations. You should read all the steps in each part before you start and work in groups. Make sure you read Serway & Faughn sections 15.1 & 15.2. Pre-Lab Questions: 1. A thin stream of water bends toward a positively charged object. What will happen to the same stream of water when a negatively charged object is placed near it? Explain. 2. A balloon, which is negatively charged by rubbing, clings to a wall. Does this mean that the wall is positively charged? Why does the balloon eventually fall? 3. Two charged pith balls are suspended on very light 10.5 cm strings. Each has a mass of 11.0 g. In equilibrium, the total angle between the strings is 35.0°. Draw a free-body diagram for one of the pith balls and clearly label all forces with magnitude and direction. Assuming the pith balls are equally charged, what is the charge on each ball? (This is not a qualitative prediction; a numerical answer must be obtained.) Part A – Charge: A1. You and your partner should each press a 10 cm long piece of tape sticky side down on the lab bench, with one end curled over as a non-stick handle. Peel the tape off the table and bring the non- sticky side of the tape toward your partner’s strip. What happens as the tapes get closer together? A2. Place two strips of tape on the table sticky side down with a non-stick handle and label then “B” for Bottom. Press another tape (with a non-stick handle) on top of each of the “B” pieces; label these strips “T” for top. Pull each pair of strips off the table. Then pull Top and Bottom strips apart. Describe the interaction between two Bottom strips. Describe the interaction between two Top strips. Describe the interaction between a Top and a Bottom strip. A3. We say that the tapes are “charged”. Based only on the experiments you did in A2, answer the following questions: Do the experiments in A2 provide evidence of the number of types of charges that exist? Explain your reasoning. If so, for how many types of charge do you have evidence? Explain. Do you have sufficient evidence (based on your experiments only) to determine the number of types of charge that exist? Could there be more or less charges than in your answer you gave in the previous question?
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