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phys1bl lab1

phys1bl lab1 - Physics 1BL Introduction CHARGE Spring 2009...

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Physics 1BL · C HARGE · Spring 2009 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 of two. Pre-Lab Read Serway & Faughn sections 15.1 & 15.2. 1. Look at the procedure at the beginning of experiment A. Imagine doing this procedure for two pieces of tape. a) Would you expect the pieces of tape to be charged after quickly pulling them off the table? b) Will the pieces of tape attract (or repel) each other as you bring them close together (but not touching)? Explain your answer. 2. In experiment B you will rub a piece of PVC pipe with some wool & touch the PVC to the aluminum foil. a) Will the PVC be charged after rubbing it with the wool? b) Will the aluminum be charged? (Remember, you have touched the aluminum with the PVC pipe) c) Based on your answers to a) and b), can the PVC cause the aluminum to move? Explain your answer (hint: can the PVC give a charge to the aluminum? See 15.2 in Serway). 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.
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Physics 1BL · C HARGE · Spring 2009 Page 2 Do you have sufficient evidence (based on your experiments only) to determine the number of
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phys1bl lab1 - Physics 1BL Introduction CHARGE Spring 2009...

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