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1 Use the lab photo as a guide to suspend a 15-cm plastic ruler It is advisable to wash the ruler in soapy water, then rinse and dry it thoroughly before each use, especially if it is a humid day The thread should be attached at the midpoint of the ruler with two or three wraps of masking tape between the thread and ruler 2 Use the following situations as a reference for types of charges a material can have: 1) a plastic ruler rubbed with wool gives the plastic ruler an excess negative charge and the wool an excess positive charge, and 2) a plastic ruler rubbed with plastic wrap gives the plastic ruler an excess positive charge and the plastic wrap an excess negative charge
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Material 1 Material 2 Charge on Ruler ( , , 0) Observation of Ruler s Movements Charge on Material 1 ( , , 0) Charge on Material 2 ( , , 0)
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3 Design a procedure to test which objects tend to become negatively charged and which tend to become positively charged Try various combinations of materials and record your observations in the data table 4 Develop a test to see if an object is neutral Remember that a charged ruler may be attracted to a neutral object if it induces a separation of charge in the neutral object 5 Be sure to check with your teacher and have your procedure approved before you proceed with your lab
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1 Explain what is meant by the phrases excess charge and charge imbalance when referring to static electricity 2 Does excess charge remain on a material or does it dissipate over time 3 Could you complete this physics lab using a metal rod in place of the suspended plastic ruler Explain 4 Clear plastic wrap seals containers of food Why does plastic wrap cling to itself after it is pulled from its container
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1 Observe and Infer As you brought charged materials together, could you detect a force between the charged materials Describe this force 2 Formulate Models Make a drawing of the charge distribution on the two materials for one of your trials Use this drawing to explain why the materials acted the way they did during your experiments with them 3 Draw Conclusions Which materials hold an excess charge Which materials do not hold a charge very well 4 Draw Conclusions Which materials tend to become negatively charged Which tend to become positively charged 5 Interpret Data Use your data table to list the relative tendencies of materials to be positively or negatively charged
Going Further
Review the information in your textbook about electroscopes Redesign the lab using an electroscope, rather than a suspended ruler, to test for the type of charge on an object
Real-World Physics
Trucks often have a rubber strap or a chain that drags along the road Why are they used
To find out more about static charge, visit the Web site: physicsppcom
Spacecraft and Static Electricity
Most objects on Earth do not build up
substantial static-electric charges because a layer of moisture clings to surfaces, allowing charges to migrate to or from the ground As you learned in this chapter, Earth can absorb almost any amount of charge However, there is no moisture in space, and Earth is far away Charged particles ejected from the Sun, or in the ionosphere, strike and cling to spacecraft, charging their surfaces to thousands of volts spacecraft s components, there is a remote chance that the buildup of charge might endanger astronauts on space walks To discharge the potential difference and protect craft and crew, the space station s skin must be connected by a conductor, called a plasma contactor, to the plasma cloud surrounding it The connection begins on board the station, where a stream of xenon gas from a tank in the Plasma Contactor Unit (PCU) is ionized by an electric current This ionization takes place in the cathode assembly The ionized xenon, now in the plasma state, passes out of the craft through the cathode assembly It is this stream of conductive plasma that connects the craft to the surrounding plasma cloud, thereby reducing the potential difference to safe levels
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